Feed Wi-Fi PSK to nmcli --ask on stdin, never argv

First connect (and reuse-with-password) no longer puts the secret on
nmcli's command line, so it is not visible in /proc/<pid>/cmdline.
networks.toml stays 0600; the local copy is still cleared after first
success.

.forgejo/workflows/check.yml

@@ -0,0 +1,24 @@
+name: check
+
+# Fast-fail lint/test on short-lived work branches, before it ever reaches
+# main and triggers a dev-track release build.
+on:
+  push:
+    branches: ['feature/**', 'fix/**']
+
+jobs:
+  check:
+    runs-on: [self-hosted, hestia]
+    steps:
+      - name: checkout
+        run: |
+          set -euo pipefail
+          rm -rf src && mkdir src
+          git clone --branch "${GITHUB_REF_NAME}" --depth 1 \
+            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
+
+      - name: clippy
+        run: cd src && bash ci/build.sh cargo clippy --all-targets --locked -- -D warnings
+
+      - name: test
+        run: cd src && bash ci/build.sh cargo test --release --locked

.forgejo/workflows/dev-release.yml

@@ -0,0 +1,77 @@
+name: dev release
+
+# Publishes a dev-track build on every push to `main` (the trunk
+# branch — there is no separate `dev` branch). See bread-ecosystem's
+# docs/release-channels.md for the release-track policy this is part of.
+on:
+  push:
+    branches: ['main']
+
+jobs:
+  build:
+    runs-on: [self-hosted, hestia]
+    steps:
+      - name: checkout
+        run: |
+          set -euo pipefail
+          rm -rf src && mkdir src
+          git clone --branch main --depth 1 \
+            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
+
+      - name: build
+        run: cd src && bash ci/build.sh cargo build --release --locked
+
+      - name: compute dev version
+        run: |
+          set -euo pipefail
+          cd src
+          # Base the dev version off the latest published stable tag,
+          # not Cargo.toml — Cargo.toml can go stale relative to the last
+          # real release (seen in practice: breadbox/breadpad/breadcrumbs/
+          # breadpaper), which would make a dev build sort as OLDER than
+          # what's already installed and bakery would correctly refuse it.
+          LATEST_TAG="$(git ls-remote --tags --refs \
+            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" 'v*' \
+            | awk -F/ '{print $NF}' | sed 's/^v//' | (grep -v -- '-' || true) | sort -V | tail -1)"
+          if [ -n "${LATEST_TAG}" ]; then
+            CUR="${LATEST_TAG}"
+          else
+            CUR="$(grep -m1 '^version' Cargo.toml | sed -E 's/.*"(.*)".*/\1/')"
+          fi
+          IFS='.' read -r MA MI PA <<< "${CUR}"
+          SHA="$(git rev-parse --short HEAD)"
+          TS="$(date -u +%Y%m%d%H%M%S)"
+          echo "VERSION=${MA}.${MI}.$((PA + 1))-dev.${TS}+${SHA}" >> "$GITHUB_ENV"
+
+      - name: prepare artifacts
+        run: |
+          set -euo pipefail
+          PKG_DIR="/srv/breadway-dl/dev/breadcrumbs/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          cp "src/target/release/breadcrumbs" "${PKG_DIR}/breadcrumbs-x86_64"
+          strip "${PKG_DIR}/breadcrumbs-x86_64"
+          sha256sum "${PKG_DIR}/breadcrumbs-x86_64" | awk '{print $1}' \
+            > "${PKG_DIR}/breadcrumbs-x86_64.sha256"
+          cp src/breadcrumbs.example.toml "${PKG_DIR}/"
+          cp src/LICENSE "${PKG_DIR}/"
+          cp src/bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "/srv/breadway-dl/dev/breadcrumbs/latest"
+
+      # No GitHub Release upload — dev, like the other non-stable track,
+      # is only distributed via dl.breadway.dev/dev/.
+      - name: regenerate dev index.json
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+        run: |
+          set -euo pipefail
+          if [ -z "${MINISIGN_SEC_KEY:-}" ]; then
+            echo "::error::BAKERY_MINISIGN_SEC_KEY_PATH secret not set — refusing to regenerate dev index.json unsigned (would leave a stale signature mismatched against fresh content and break bakery for everyone on the dev track)"
+            exit 1
+          fi
+          rm -rf /tmp/bread-ecosystem-ci-* 2>/dev/null || true
+          # mktemp: a fixed clone path races when multiple repos' dev/beta
+          # workflows run close together on the same self-hosted runner.
+          ECOSYSTEM_CI_DIR="$(mktemp -d /tmp/bread-ecosystem-ci-XXXXXX)"
+          git clone --branch main https://git.breadway.dev/Breadway/bread-ecosystem.git "${ECOSYSTEM_CI_DIR}"
+          TRACK=dev bash "${ECOSYSTEM_CI_DIR}/scripts/gen-index.sh"
+          rm -rf "${ECOSYSTEM_CI_DIR}"

.forgejo/workflows/mirror.yml

@@ -1,21 +0,0 @@
-name: Mirror to GitHub
-
-on:
-  push:
-    branches: ['**']
-    tags: ['**']
-
-jobs:
-  mirror:
-    runs-on: [self-hosted, hestia]
-    steps:
-      - name: Mirror to GitHub
-        run: |
-          set -euo pipefail
-          git clone --mirror "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" repo.git
-          cd repo.git
-          # Mirror only branches and tags (not refs/pull/*, which GitHub rejects);
-          # --prune deletes GitHub refs that no longer exist on Forgejo.
-          git push --prune \
-            "https://x-access-token:${{ secrets.MIRROR_TOKEN }}@github.com/Breadway/breadcrumbs.git" \
-            '+refs/heads/*:refs/heads/*' '+refs/tags/*:refs/tags/*'

.forgejo/workflows/package.yml

@@ -1,40 +0,0 @@
-name: Build and publish package
-
-on:
-  push:
-    tags: ['v*']
-
-jobs:
-  package:
-    runs-on: [self-hosted, hestia]
-    container:
-      image: archlinux:latest
-    steps:
-      # Note: no actions/checkout — the archlinux image has no Node, which JS
-      # actions require. Everything runs as shell steps and clones manually.
-      - name: Build and publish
-        env:
-          PUBLISH_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-        run: |
-          set -euo pipefail
-          VERSION="${GITHUB_REF_NAME#v}"
-          pacman -Syu --noconfirm base-devel git rust cargo networkmanager
-          useradd -m builder
-          git config --global --add safe.directory '*'
-          git clone --branch "${GITHUB_REF_NAME}" --depth 1 \
-            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" /home/builder/src
-          cd /home/builder/src
-          git archive --format=tar.gz --prefix="breadcrumbs-${VERSION}/" HEAD \
-            > packaging/arch/breadcrumbs-${VERSION}.tar.gz
-          SHA=$(sha256sum packaging/arch/breadcrumbs-${VERSION}.tar.gz | awk '{print $1}')
-          sed -i "s/^pkgver=.*/pkgver=${VERSION}/" packaging/arch/PKGBUILD
-          sed -i "s/^sha256sums=.*/sha256sums=('${SHA}')/" packaging/arch/PKGBUILD
-          chown -R builder:builder /home/builder/src
-          # --nocheck: packaging builds the artifact; tests belong in a CI job.
-          su builder -c "cd /home/builder/src/packaging/arch && makepkg -f --noconfirm --nocheck"
-          PKG=$(find /home/builder/src/packaging/arch -name '*.pkg.tar.zst' | head -1)
-          curl -fsS -X PUT \
-            -H "Authorization: token ${PUBLISH_TOKEN}" \
-            -H "Content-Type: application/octet-stream" \
-            --data-binary "@${PKG}" \
-            "https://git.breadway.dev/api/packages/Breadway/arch/os"

.forgejo/workflows/rc-release.yml

@@ -0,0 +1,58 @@
+name: beta (rc) release
+
+# Publishes a beta-track build for any `vX.Y.Z-rc.N` prerelease tag
+# pushed to `main` — there is no separate `beta` branch; "freezing" is
+# just pausing pushes to main while an RC gets tested. See
+# bread-ecosystem's docs/release-channels.md for the release-track policy.
+on:
+  push:
+    tags: ['v*']
+
+jobs:
+  build:
+    if: ${{ contains(github.ref_name, '-rc.') }}
+    runs-on: [self-hosted, hestia]
+    steps:
+      - name: checkout
+        run: |
+          set -euo pipefail
+          rm -rf src && mkdir src
+          git clone --branch "${GITHUB_REF_NAME}" --depth 1 \
+            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
+
+      - name: build
+        run: cd src && bash ci/build.sh cargo build --release --locked
+
+      - name: prepare artifacts
+        run: |
+          set -euo pipefail
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="/srv/breadway-dl/beta/breadcrumbs/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          cp "src/target/release/breadcrumbs" "${PKG_DIR}/breadcrumbs-x86_64"
+          strip "${PKG_DIR}/breadcrumbs-x86_64"
+          sha256sum "${PKG_DIR}/breadcrumbs-x86_64" | awk '{print $1}' \
+            > "${PKG_DIR}/breadcrumbs-x86_64.sha256"
+          cp src/breadcrumbs.example.toml "${PKG_DIR}/"
+          cp src/LICENSE "${PKG_DIR}/"
+          cp src/bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "/srv/breadway-dl/beta/breadcrumbs/latest"
+
+      # No GitHub Release upload — beta, like dev, is only distributed via
+      # dl.breadway.dev/beta/.
+      - name: regenerate beta index.json
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+        run: |
+          set -euo pipefail
+          if [ -z "${MINISIGN_SEC_KEY:-}" ]; then
+            echo "::error::BAKERY_MINISIGN_SEC_KEY_PATH secret not set — refusing to regenerate beta index.json unsigned (would leave a stale signature mismatched against fresh content and break bakery for everyone on the beta track)"
+            exit 1
+          fi
+          rm -rf /tmp/bread-ecosystem-ci-* 2>/dev/null || true
+          # mktemp: a fixed clone path races when multiple repos' dev/beta
+          # workflows run close together on the same self-hosted runner.
+          ECOSYSTEM_CI_DIR="$(mktemp -d /tmp/bread-ecosystem-ci-XXXXXX)"
+          git clone https://git.breadway.dev/Breadway/bread-ecosystem.git "${ECOSYSTEM_CI_DIR}"
+          TRACK=beta bash "${ECOSYSTEM_CI_DIR}/scripts/gen-index.sh"
+          rm -rf "${ECOSYSTEM_CI_DIR}"

.forgejo/workflows/release.yml

@@ -0,0 +1,74 @@
+name: release
+
+on:
+  push:
+    tags: ["v*"]
+
+jobs:
+  build:
+    if: ${{ !contains(github.ref_name, '-rc.') }}
+    runs-on: [self-hosted, hestia]
+    steps:
+      - name: checkout
+        run: |
+          set -euo pipefail
+          rm -rf src && mkdir src
+          git clone --branch "${GITHUB_REF_NAME}" --depth 1 \
+            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
+
+      - name: build
+        run: |
+          set -euo pipefail
+          if [ ! -f src/ci/build.sh ]; then
+            echo "::error::ci/build.sh is missing — bakery release builds must go through the shared CI wrapper"
+            exit 1
+          fi
+          cd src && bash ci/build.sh cargo build --release --locked || {
+            echo "::error::cargo build --release --locked failed. If Cargo.lock drifted, update and commit it; do not drop --locked."
+            exit 1
+          }
+
+      - name: test
+        run: cd src && bash ci/build.sh cargo test --release --locked
+
+      - name: prepare artifacts
+        run: |
+          set -euo pipefail
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="/srv/breadway-dl/breadcrumbs/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          cp src/target/release/breadcrumbs "${PKG_DIR}/breadcrumbs-x86_64"
+          strip "${PKG_DIR}/breadcrumbs-x86_64"
+          sha256sum "${PKG_DIR}/breadcrumbs-x86_64" | awk '{print $1}' \
+            > "${PKG_DIR}/breadcrumbs-x86_64.sha256"
+          cp src/breadcrumbs.example.toml "${PKG_DIR}/"
+          cp src/LICENSE "${PKG_DIR}/"
+          cp src/bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "/srv/breadway-dl/breadcrumbs/latest"
+
+      - name: regenerate index.json
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+        run: |
+          set -euo pipefail
+          if [ -z "${MINISIGN_SEC_KEY:-}" ]; then
+            echo "::error::BAKERY_MINISIGN_SEC_KEY_PATH secret not set — refusing to regenerate index.json unsigned (would leave a stale signature mismatched against fresh content and break bakery for everyone)"
+            exit 1
+          fi
+          rm -rf /tmp/bread-ecosystem-ci
+          git clone https://git.breadway.dev/Breadway/bread-ecosystem.git /tmp/bread-ecosystem-ci
+          bash /tmp/bread-ecosystem-ci/scripts/gen-index.sh
+
+      - name: upload to GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.GH_RELEASE_TOKEN }}
+        run: |
+          set -euo pipefail
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="/srv/breadway-dl/breadcrumbs/${VERSION}"
+          gh release create "${GITHUB_REF_NAME}" --repo Breadway/breadcrumbs \
+            --title "breadcrumbs v${VERSION}" --generate-notes 2>/dev/null || true
+          gh release upload "${GITHUB_REF_NAME}" --repo Breadway/breadcrumbs \
+            "${PKG_DIR}/breadcrumbs-x86_64" \
+            "${PKG_DIR}/breadcrumbs-x86_64.sha256" \
+            --clobber

.gitignore

@@ -1,9 +1,12 @@
 # Build output
 /target/
 
-# Secrets: live config holds plaintext Wi-Fi passwords.
-# Keep local only; see breadcrumbs.example.toml for the schema.
+# Secrets: live config holds plaintext Wi-Fi passwords (until NetworkManager
+# takes over each one on first connect — see README's "Credential handling").
+# Keep local only; see breadcrumbs.example.toml / networks.example.toml for
+# the schemas.
 /breadcrumbs.toml
+/networks.toml
 
 # Legacy plaintext credential store (migrated into breadcrumbs.toml on first run)
 /Networks/
@@ -34,3 +37,9 @@ desktop.ini
 
 # Claude Code local state
 .claude/
+
+# Local hygiene notes (not for commit)
+CLAUDE.md
+
+# graphify knowledge-graph output (local tool cache, not for commit)
+graphify-out/

AGENTS.md

@@ -0,0 +1,50 @@
+# AGENTS.md — Repo hygiene
+
+Scope: this file covers *repo hygiene* — branching, remotes, CI, cleanup. It is not project documentation.
+
+This repo follows the branch/release workflow documented in `CONTRIBUTING.md`
+— read and follow it for any git, branch, or release work here (the
+single-trunk model, `feature/x`/`fix/x` branch naming, how RC tags work,
+etc). Don't improvise a different workflow. The short version: there is one
+long-lived branch, `main` — no `dev` or `beta` branch exists. `main`
+auto-publishes a dev-track build on every push. "Beta" and "stable" are both
+just tags, not branches: push a `vX.Y.Z-rc.N` tag to publish a beta-track
+build, push a plain `vX.Y.Z` tag to cut the signed stable release.
+"Freezing" for stabilization means pausing pushes to `main`, not moving a
+branch. This replaced an earlier three-branch (`dev`/`beta`/`main`) model
+after `main` was found to have silently rotted out of sync with `dev`/`beta`
+across most repos in this ecosystem — a manual "merge beta into main
+monthly" step nobody reliably did across a dozen-plus repos. Collapsing to
+one branch removes the class of bug; there's nothing left that can fall out
+of sync.
+
+## Remotes
+- `origin` — Forgejo (`git.breadway.dev` via Hestia, SSH) — authoritative.
+- `github` — GitHub mirror. Push both when publishing. Agents push `origin` only; the GitHub remote auto-mirrors.
+
+## Distribution
+- Bakery-only. `bakery.toml` is the product manifest; there is no
+  `packaging/arch/PKGBUILD` in this repo.
+- Tracks: `bakery track set {dev,beta,stable}` then `bakery update breadcrumbs`
+  (or `bakery update --all`). See CONTRIBUTING.md and bread-ecosystem's
+  `docs/release-channels.md`.
+
+## Events
+- Bread bus contract: `EVENTS.md`. App id is `crumbs`.
+- Fail-silent: breadcrumbs behaves the same whether `breadd` is running or
+  not. Commands (`bread.command.crumbs.*`) are only received while
+  `breadcrumbs watch` / the user systemd unit is up.
+
+## CI
+- `check.yml` — clippy + `cargo test --release` on `feature/**` and `fix/**`.
+- `dev-release.yml` — triggered on push to `main` (dev-track bakery publish).
+- `rc-release.yml` — triggered on any `vX.Y.Z-rc.N` tag push (beta track).
+- `release.yml` — triggered on any other `v*` tag push (signed stable).
+
+All CI runs on a self-hosted runner. No build/lint/test CI runs on ordinary
+commits or PRs to `main` beyond the dev-track workflow above.
+
+## Don't
+- Don't embed credentials in remote URLs — SSH or a credential helper only.
+- Don't invent bread command verbs that have no real breadcrumbs feature
+  behind them. See EVENTS.md.

CONTRIBUTING.md

@@ -0,0 +1,84 @@
+# Contributing
+
+`breadcrumbs` — Profile-aware Wi-Fi state machine with Tailscale integration.
+
+Part of the bread ecosystem; this repo follows the same branch/release
+workflow as every other ecosystem product.
+
+## Branches
+
+There is one long-lived branch: **`main`**. All day-to-day work lands here.
+Every push to `main` automatically builds and publishes a **dev-track**
+build (see Tracks below) — a real install you can test before cutting
+anything more formal.
+
+New work — features and bug fixes alike — goes on a short-lived branch:
+
+```
+feature/<short-name>
+fix/<issue-number-or-short-name>
+```
+
+Branch off `main`, open a PR/push back into `main` when ready. Short-lived
+branches get deleted on merge — they never accumulate the kind of drift a
+second long-lived branch does.
+
+## The release cycle
+
+There's no separate `beta` or release branch — "stable" and "beta" are both
+just **tags** on `main`, not branches that need to be kept in sync:
+
+1. Work accumulates on `main` via `feature/x` / `fix/x` branches. Each push
+   auto-publishes a dev build — install it with `bakery track set dev` and
+   `bakery update --all`, then fix anything broken with another push.
+2. When you want to stabilize before a real release, tag a release
+   candidate: `git tag vX.Y.Z-rc.1 && git push origin vX.Y.Z-rc.1` (push to
+   both remotes). That tag alone triggers a beta-track build —
+   "freezing" is just pausing pushes to `main` while you test it, not a
+   branch operation. Cut `-rc.2`, `-rc.3`, etc. for further fixes.
+3. Once an RC has gone without issues, tag the real release:
+   `git tag vX.Y.Z && git push origin vX.Y.Z` — that's what triggers the
+   signed stable release build.
+
+## Tracks, from a user's perspective
+
+```
+bakery track show              # what you're currently on (defaults to stable)
+bakery track set dev           # or beta, or stable
+bakery update --all            # pull the latest build on your current track
+```
+
+| Track  | What it is | Published from |
+|--------|-----------|-----------------|
+| `stable` | The last tagged release | a `vX.Y.Z` tag |
+| `beta` | Latest release candidate | a `vX.Y.Z-rc.N` tag |
+| `dev` | Bleeding edge | `main`, on every push |
+
+Dev versions are auto-computed (`X.Y.Z-dev.<timestamp>+<sha>`) from the
+latest published stable tag, so they always sort as newer than what you
+have installed — no manual version bumping needed. Beta versions are just
+the RC tag itself (already valid semver, already sorts below the real
+release it's a candidate for).
+
+## Local development
+
+```sh
+cargo build --release
+cargo test --release
+```
+
+## CI
+
+- `dev-release.yml` — triggered on push to `main`.
+- `rc-release.yml` — triggered on any `vX.Y.Z-rc.N` tag push.
+- `release.yml` — triggered on any other `v*` tag push, cuts the actual
+  stable release.
+
+All CI runs on a self-hosted runner; nothing runs automatically on plain
+commits or PRs beyond the track builds above. See
+[bread-ecosystem's docs/release-channels.md](https://git.breadway.dev/Breadway/bread-ecosystem/src/branch/main/docs/release-channels.md)
+for the full policy, including how a new product gets wired onto these tracks.
+
+## Questions
+
+Open an issue on this repo's Forgejo tracker.

Cargo.lock

@@ -38,7 +38,7 @@ version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -49,19 +49,48 @@ checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
 dependencies = [
  "anstyle",
  "once_cell_polyfill",
- "windows-sys",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "bread-shared"
+version = "0.7.0"
+source = "git+https://git.breadway.dev/Breadway/bread?tag=v0.7.0#22e34e2cf2202305d7960759dfccb54dc79f948b"
+dependencies = [
+ "dirs",
+ "serde",
+ "serde_json",
+ "toml",
+]
+
+[[package]]
+name = "bread-utils"
+version = "0.7.2"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?tag=v0.7.2#30517f161724132cdeb658c04cf5e490be07ee73"
+dependencies = [
+ "bread-shared",
+ "dirs",
+ "serde",
+ "serde_json",
 ]
 
 [[package]]
 name = "breadcrumbs"
-version = "2.0.1"
+version = "2.1.7"
 dependencies = [
+ "bread-utils",
  "clap",
  "serde",
  "serde_json",
  "toml",
 ]
 
+[[package]]
+name = "cfg-if"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+
 [[package]]
 name = "clap"
 version = "4.6.1"
@@ -108,12 +137,44 @@ version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
 
+[[package]]
+name = "dirs"
+version = "5.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44c45a9d03d6676652bcb5e724c7e988de1acad23a711b5217ab9cbecbec2225"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "520f05a5cbd335fae5a99ff7a6ab8627577660ee5cfd6a94a6a929b52ff0321c"
+dependencies = [
+ "libc",
+ "option-ext",
+ "redox_users",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "getrandom"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.17.1"
@@ -148,6 +209,21 @@ version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
 
+[[package]]
+name = "libc"
+version = "0.2.189"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3eaf3ede3fee6db1a4c2ee091bf8a8b4dccdc6d17f656fb07896ee72867612f2"
+
+[[package]]
+name = "libredox"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d0a00925a9f930d679b6789b721e3a7f9ed110f41b86d2497caa780c3a070a"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memchr"
 version = "2.8.0"
@@ -160,6 +236,12 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
 
+[[package]]
+name = "option-ext"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -178,6 +260,17 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "redox_users"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba009ff324d1fc1b900bd1fdb31564febe58a8ccc8a6fdbb93b543d33b13ca43"
+dependencies = [
+ "getrandom",
+ "libredox",
+ "thiserror",
+]
+
 [[package]]
 name = "serde"
 version = "1.0.228"
@@ -247,6 +340,26 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "toml"
 version = "0.8.23"
@@ -300,12 +413,27 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "wasi"
+version = "0.11.1+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.61.2"
@@ -315,6 +443,63 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-targets"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
 [[package]]
 name = "winnow"
 version = "0.7.15"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "breadcrumbs"
-version = "2.0.1"
+version = "2.1.7"
 edition = "2021"
 description = "Profile-aware Wi-Fi state machine with Tailscale handling and self-healing watch daemon"
 license = "MIT"
@@ -14,6 +14,7 @@ clap = { version = "4", features = ["derive"] }
 serde = { version = "1", features = ["derive"] }
 toml = "0.8"
 serde_json = "1"
+bread-utils = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", tag = "v0.7.2", features = ["bread-client"] }
 
 [profile.release]
 opt-level = "s"

EVENTS.md

@@ -0,0 +1,78 @@
+# breadcrumbs — bread event integration
+
+breadcrumbs is a standalone Wi-Fi state machine: it works exactly the same
+with or without `breadd` running. When breadd *is* present **and** the
+`breadcrumbs watch` daemon (or the systemd user service it installs) is up,
+breadcrumbs publishes events into the shared bread automation fabric and
+listens for a small set of commands. See the parent `bread` repo's
+`Documentation.md` — specifically its "Namespaces" and "Integrating a
+bread\* app" sections — for the general convention this follows.
+
+App id: **`crumbs`**. Transport: `bread-utils`'s `bread_client` module
+(feature `bread-client`) — the watch process links it directly, since it's
+the long-running piece that both emits on real transitions and holds the
+command subscription open.
+
+One-shot CLI invocations (`breadcrumbs status`, `profile set`, `init`, …)
+do **not** emit or subscribe on their own. A `breadcrumbs profile set home`
+while the watcher is running is picked up on the watcher's next tick
+(state is re-read every loop) and *then* published as
+`bread.crumbs.profile.changed`. If the watcher is not running, the CLI
+still switches the profile on disk — there is just nobody listening for
+`bread.command.crumbs.*`, and nobody emitting `bread.crumbs.*`.
+
+## Events published (`bread.crumbs.*`)
+
+| Event | Data | When |
+|-------|------|------|
+| `bread.crumbs.profile.changed` | `{ "from": "<name>", "to": "<name>" }` | The watch loop observes that the persisted active profile is no longer the one it last acted on (CLI `profile set`, `detect --apply`, or `bread.command.crumbs.set_profile`). Not emitted on watcher start just because a profile is already selected. |
+| `bread.crumbs.health.changed` | `{ "profile": "<name>", "health": "<variant>", "ssid": <string or null> }` | The watch loop's health classification changes — including the first observation after start, and the forced re-evaluation after a profile change. **Not** emitted on every poll tick while the classification stays the same. |
+| `bread.crumbs.set_profile.done` | `{ "profile": "<name>" }` | `bread.command.crumbs.set_profile` persisted the new profile. |
+| `bread.crumbs.set_profile.failed` | `{ "error": "<message>" }` | `bread.command.crumbs.set_profile` was received but rejected (unknown profile, missing `profile` field, config unreadable). |
+
+`health` is the Rust enum variant name, not a prettier label:
+
+| Variant | Meaning |
+|---------|---------|
+| `Up` | Adapter present, internet reachable, Tailscale healthy if the profile requires it. |
+| `DownNoNet` | No internet. |
+| `DownTailscaleManual` | Tailscale required but needs login / isn't installed — cannot auto-fix. |
+| `DownTailscaleOther` | Tailscale required and unhealthy for some other (usually auto-recoverable) reason. |
+| `NoAdapter` | No Wi-Fi interface. |
+| `UnknownProfile` | Persisted profile name is not in the config. |
+
+`ssid` is the currently-associated SSID, or `null` when there isn't one
+(no adapter, not associated, unknown profile).
+
+## Commands honored (`bread.command.crumbs.*`)
+
+These are only received while `breadcrumbs watch` / `breadcrumbs.service`
+is running. Publishing a command with no subscriber is a silent no-op —
+that is the documented bread convention, not a breadcrumbs bug.
+
+| Verb | Data | Effect |
+|------|------|--------|
+| `set_profile` | `{ "profile": "<name>" }` | Persist `<name>` via the same `state::set_profile` path the CLI uses. Wakes the watch loop immediately so the new profile is classified (and recovered, if down) on the next tick rather than waiting out the current poll interval. Does **not** run `flow::run` on the command thread — that would race the watch loop. Emits `bread.crumbs.set_profile.done`/`.failed`. |
+
+### Not implemented: extra verbs
+
+There is no `pin`, `select`, `scan`, `init`, or other command verb. The
+CLI already covers those as synchronous one-shots (`breadcrumbs init`,
+`breadcrumbs scan`, …), and breadcrumbs has no "pinned network" concept
+to hang a bus verb on. If/when that changes, the corresponding
+`bread.command.crumbs.*` verb should be added at the same time, not
+stubbed out ahead of it.
+
+## Fail-safe behavior
+
+- If breadd isn't installed or isn't running, `emit` is a silent no-op
+  (`BreadClient::emit` never blocks or errors the caller) and the
+  command subscription simply never receives anything — breadcrumbs'
+  actual Wi-Fi / Tailscale / watch functionality is entirely unaffected
+  either way.
+- If breadd restarts, the command subscription reconnects automatically
+  (`BreadClient::subscribe`'s background thread has its own backoff loop);
+  no restart of the breadcrumbs watcher is needed.
+- If the breadcrumbs watcher is not running, commands are a graceful
+  no-op at the bus (no subscriber) and no `bread.crumbs.*` events fire.
+  The CLI still works.

README.md

@@ -10,7 +10,7 @@ breadcrumbs sits on top of NetworkManager (`nmcli`) and manages your Wi-Fi based
 - **Bootstrap + Tailscale gating** — connect to an interim network first, bring up Tailscale, then move to the target network
 - **Self-healing watch daemon** — monitors for drops, auto-recovers, reacts within seconds via `nmcli monitor`
 - **Auto-detection** — scans visible SSIDs and guesses your location from config-defined markers
-- **Secure credential handling** — passwords fed to `nmcli` via stdin (never in argv/`ps`), config stored at 0600
+- **Credential handling** — a saved network's password is only needed the *first* time breadcrumbs connects to it. Once that connect succeeds, NetworkManager durably owns the credential (a new connection profile, or an updated PSK on an existing one), so breadcrumbs clears its own local copy and stops writing it to disk. Both config files are `0600` (owner-only); saved networks live in a separate `networks.toml` from settings/profiles (see [Configuration](#configuration)). On that first connect the PSK is fed to `nmcli --ask` on stdin, never as a command argument, so it does not appear in `/proc/<pid>/cmdline`.
 - **Desktop notifications** via `notify-send` (optional)
 - **systemd user service** generation via `breadcrumbs install-service`
 
@@ -34,17 +34,21 @@ cp target/release/breadcrumbs ~/.local/bin/
 
 ## Configuration
 
-On first run, breadcrumbs creates `~/.config/breadcrumbs/breadcrumbs.toml` with default profiles. Copy `breadcrumbs.example.toml` as a starting point and fill in your real network credentials:
+On first run, breadcrumbs creates `~/.config/breadcrumbs/breadcrumbs.toml` (settings + profiles) and `~/.config/breadcrumbs/networks.toml` (saved networks) with default profiles. Copy `breadcrumbs.example.toml` as a starting point for the former:
 
 ```bash
 cp breadcrumbs.example.toml ~/.config/breadcrumbs/breadcrumbs.toml
-breadcrumbs edit   # opens in $EDITOR
+breadcrumbs edit   # opens breadcrumbs.toml in $EDITOR
 ```
 
+...then add your real networks with `breadcrumbs add`/`scan` rather than hand-editing `networks.toml` (see `networks.example.toml` if you want to see its shape or write it by hand anyway).
+
 Config paths respect `$XDG_CONFIG_HOME` and `$XDG_STATE_HOME`.
 
 ### Config structure
 
+Settings and location profiles live in `breadcrumbs.toml` — the file people actually hand-edit or dotfile:
+
 ```toml
 [settings]
 dns = "1.1.1.1"          # DNS server pinned on every connection
@@ -55,11 +59,6 @@ watch_interval = 12      # seconds between health checks (minimum 4)
 connectivity_url = "http://connectivitycheck.gstatic.com/generate_204"
 ping_host = "1.1.1.1"
 
-[[networks]]
-ssid = "MyHomeNetwork"
-password = "hunter2"
-hidden = false
-
 [profiles.home]
 networks = ["MyHomeNetwork"]  # priority-ordered SSIDs
 tailscale = false
@@ -74,6 +73,17 @@ exit_node = "jump-host"   # per-profile override
 detect_ssids = ["CorpWifi", "Corp-5G"]
 ```
 
+Saved networks (SSID + optional local password) live separately, in `networks.toml`, managed via `add`/`scan`/`forget`:
+
+```toml
+[[networks]]
+ssid = "MyHomeNetwork"
+password = "hunter2"  # optional — see "Credential handling" below
+hidden = false
+```
+
+`password` is only needed the first time breadcrumbs connects to a network. Once NetworkManager durably saves the credential, breadcrumbs clears its local copy and omits the key on the next save — an existing config with `password = "..."` still loads fine either way, no migration step needed. A config with `[[networks]]` still written inline in `breadcrumbs.toml` (from before this split) also still loads: it's read once, then migrated into `networks.toml` automatically on the next save.
+
 ### Profiles
 
 Each profile defines:

bakery.toml

@@ -4,6 +4,7 @@ binaries = ["breadcrumbs"]
 system_deps = ["networkmanager"]
 optional_system_deps = ["tailscale", "sudo", "xdg-utils"]
 bread_deps = []
+license_file = "LICENSE"
 
 [config]
 dir = "~/.config/breadcrumbs"

breadcrumbs.example.toml

@@ -4,6 +4,12 @@
 # just run breadcrumbs once (it generates a skeleton) and then use
 # `breadcrumbs add` / `breadcrumbs edit` to fill in your networks.
 # The real breadcrumbs.toml is gitignored and never committed.
+#
+# Saved networks (SSID + optional local password) live in a separate file,
+# networks.toml, in the same directory — not here. See
+# networks.example.toml for its format; in practice you never hand-edit it,
+# `breadcrumbs add` / `scan` / `forget` manage it for you. This file is just
+# settings + the location profiles built from those saved networks.
 
 [settings]
 dns = "1.1.1.1"
@@ -14,21 +20,6 @@ watch_interval = 12
 connectivity_url = "http://connectivitycheck.gstatic.com/generate_204"
 ping_host = "1.1.1.1"
 
-[[networks]]
-ssid = "HomeWifi"
-password = "REPLACE_ME"
-hidden = false
-
-[[networks]]
-ssid = "WorkGuest"
-password = "REPLACE_ME"
-hidden = false
-
-[[networks]]
-ssid = "CorpWifi"
-password = "REPLACE_ME"
-hidden = false
-
 # Location state machine. Switch with: breadcrumbs profile set <name>
 #
 # detect_ssids: list any SSIDs that reliably indicate you are at this location.

ci/bread-ecosystem.rev

@@ -0,0 +1 @@
+147cfbbf96ae4b171027defa1130d2caddb934b1

ci/build.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Delegates to bread-ecosystem's shared CI build image/script, pinned to
+# the commit in ci/bread-ecosystem.rev — not `main`. bread-ecosystem's CI
+# files now affect every product's release pipeline, so bumping the pin
+# is a deliberate act instead of silent drift (see the bread-theme test
+# that broke here for exactly that reason, before it was pinned by rev).
+#
+# Usage: ci/build.sh cargo build --release --locked
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+REV="$(cat "${ROOT}/ci/bread-ecosystem.rev")"
+
+CACHE_DIR="/tmp/bread-ecosystem-ci-${REV}"
+if [ ! -d "$CACHE_DIR" ]; then
+    rm -rf /tmp/bread-ecosystem-ci-*
+    git clone https://git.breadway.dev/Breadway/bread-ecosystem.git "$CACHE_DIR"
+    git -C "$CACHE_DIR" checkout --quiet "$REV"
+fi
+
+bash "${CACHE_DIR}/ci/build.sh" breadcrumbs "$ROOT" "$@"

networks.example.toml

@@ -0,0 +1,29 @@
+# breadcrumbs saved-networks file.
+#
+# Lives alongside breadcrumbs.toml at ~/.config/breadcrumbs/networks.toml,
+# 0600 permissions. Shown here purely for reference — you normally never
+# hand-edit this file; use `breadcrumbs add` / `scan` / `forget` instead.
+#
+# `password` is optional and only needed the first time breadcrumbs connects
+# to a network. Once NetworkManager has durably saved the credential (either
+# a brand-new connection profile, or an updated PSK on an existing one),
+# breadcrumbs clears its own local copy and omits the `password` key
+# entirely on the next save — both the plaintext-on-disk copy and the
+# argv exposure on every subsequent connect go away for that network from
+# then on. Omit `password` altogether for a genuinely open (no-security)
+# network, or for one NetworkManager already knows about.
+
+[[networks]]
+ssid = "HomeWifi"
+password = "REPLACE_ME"
+hidden = false
+
+[[networks]]
+ssid = "WorkGuest"
+password = "REPLACE_ME"
+hidden = false
+
+[[networks]]
+ssid = "CorpWifi"
+password = "REPLACE_ME"
+hidden = false

packaging/arch/PKGBUILD

@@ -1,36 +0,0 @@
-# Maintainer: Breadway <rileyhorsham@gmail.com>
-
-pkgname=breadcrumbs
-pkgver=0.1.0
-pkgrel=1
-pkgdesc="Profile-aware Wi-Fi state machine with Tailscale integration"
-arch=('x86_64')
-url="https://github.com/Breadway/breadcrumbs"
-license=('MIT')
-# Some Rust deps (ring/mlua) build vendored C/asm into static archives; makepkg's
-# default -flto=auto emits GCC LTO bitcode the Rust (lld) link cannot read,
-# causing undefined-symbol errors. Disable LTO.
-options=(!lto !debug)
-depends=('networkmanager')
-optdepends=(
-  'tailscale: Tailscale VPN profile integration'
-)
-makedepends=('rust' 'cargo')
-source=("${pkgname}-${pkgver}.tar.gz")
-sha256sums=('SKIP')
-
-build() {
-  cd "${srcdir}/${pkgname}-${pkgver}"
-  cargo build --release --locked
-}
-
-check() {
-  cd "${srcdir}/${pkgname}-${pkgver}"
-  cargo test --release --locked
-}
-
-package() {
-  cd "${srcdir}/${pkgname}-${pkgver}"
-  install -Dm755 target/release/breadcrumbs "${pkgdir}/usr/bin/breadcrumbs"
-  install -Dm644 LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
-}

src/app.rs

@@ -0,0 +1,786 @@
+//! CLI argument parsing and command handlers. This is the only module
+//! `src/main.rs` calls into; everything else (the actual state machine,
+//! nmcli/tailscale wrappers, config, …) is exercised directly by library
+//! consumers (including the integration tests under `tests/`).
+
+use std::io::{BufRead, Write};
+use std::process::Command;
+use std::time::Duration;
+
+use clap::{Parser, Subcommand};
+
+use crate::config::{Config, NetworkDef};
+use crate::state::{self, State};
+use crate::util::{self, command_exists, home_dir};
+use crate::{config, flow, nm, watch};
+
+const C_RESET: &str = "\x1b[0m";
+const C_BOLD: &str = "\x1b[1m";
+const C_GREEN: &str = "\x1b[32m";
+const C_RED: &str = "\x1b[31m";
+const C_YELLOW: &str = "\x1b[33m";
+const C_DIM: &str = "\x1b[2m";
+
+#[derive(Parser)]
+#[command(
+    name = "breadcrumbs",
+    version,
+    about = "Profile-aware Wi-Fi state machine with Tailscale handling",
+    disable_help_subcommand = true
+)]
+struct Cli {
+    /// Override the active profile for this run only (does not persist)
+    #[arg(long, short, global = true)]
+    profile: Option<String>,
+
+    #[command(subcommand)]
+    cmd: Option<Cmd>,
+}
+
+#[derive(Subcommand)]
+enum Cmd {
+    /// Show current Wi-Fi / profile / Tailscale status (default)
+    Status,
+    /// Run the full connect sequence for the active profile
+    #[command(visible_aliases = ["up", "connect", "i"])]
+    Init,
+    /// Run as a daemon: watch for drops and auto-recover
+    Watch {
+        /// Skip the connect attempt on startup
+        #[arg(long)]
+        no_initial: bool,
+    },
+    /// Get / set / list location profiles (the state machine)
+    Profile {
+        #[command(subcommand)]
+        action: Option<ProfileCmd>,
+    },
+    /// Guess the profile from visible networks
+    Detect {
+        /// Set + apply the detected profile
+        #[arg(long)]
+        apply: bool,
+    },
+    /// Add or update a saved network
+    Add {
+        ssid: String,
+        /// Password (prompted if omitted)
+        password: Option<String>,
+        /// Network is hidden (does not broadcast its SSID)
+        #[arg(long)]
+        hidden: bool,
+        /// Attach this SSID to a profile's priority list
+        #[arg(long)]
+        to: Option<String>,
+        /// Position in the profile list (0 = highest priority)
+        #[arg(long)]
+        at: Option<usize>,
+    },
+    /// Remove a saved network (config + NetworkManager)
+    Forget { ssid: String },
+    /// Scan, pick, connect and save a network interactively
+    Scan {
+        /// Attach the saved network to this profile
+        #[arg(long)]
+        to: Option<String>,
+    },
+    /// List configured networks and profiles
+    List {
+        #[arg(long)]
+        show_passwords: bool,
+    },
+    /// Open the config file in $EDITOR
+    Edit,
+    /// Quick connectivity / Tailscale diagnostics
+    Doctor {
+        /// Run the full diag.sh report from the config directory
+        #[arg(long)]
+        full: bool,
+    },
+    /// Print the breadcrumbs config directory
+    Cd {
+        #[arg(long)]
+        shell: bool,
+    },
+    /// Install + enable the systemd user watcher service
+    InstallService {
+        /// Install the unit but do not enable/start it
+        #[arg(long)]
+        no_enable: bool,
+    },
+}
+
+#[derive(Subcommand)]
+enum ProfileCmd {
+    /// Print the active profile
+    Get,
+    /// Set the active profile (and apply it unless --no-apply)
+    Set {
+        name: String,
+        #[arg(long)]
+        no_apply: bool,
+    },
+    /// List available profiles
+    List,
+}
+
+/// Parse `argv` and run the requested command. Returns the process exit code.
+pub fn run() -> i32 {
+    let cli = Cli::parse();
+    match real_main(cli) {
+        Ok(c) => c,
+        Err(e) => {
+            eprintln!("{C_RED}error:{C_RESET} {e}");
+            1
+        }
+    }
+}
+
+fn active_profile(cfg: &Config, override_p: &Option<String>) -> String {
+    if let Some(p) = override_p {
+        return p.clone();
+    }
+    State::load(&cfg.settings.default_profile).profile
+}
+
+fn real_main(cli: Cli) -> Result<i32, String> {
+    let cmd = cli.cmd.unwrap_or(Cmd::Status);
+
+    // `cd` and `install-service` don't need a parsed config first.
+    if let Cmd::Cd { shell } = &cmd {
+        return cmd_cd(*shell);
+    }
+
+    let mut cfg = Config::load()?;
+
+    match cmd {
+        Cmd::Status => cmd_status(&cfg, &cli.profile),
+        Cmd::Init => {
+            let p = active_profile(&cfg, &cli.profile);
+            let outcome = flow::run(&mut cfg, &p);
+            print_outcome(&p, &outcome);
+            Ok(if outcome.ok() { 0 } else { 1 })
+        }
+        Cmd::Watch { no_initial } => Ok(watch::run(cfg, !no_initial)),
+        Cmd::Profile { action } => cmd_profile(&mut cfg, action),
+        Cmd::Detect { apply } => cmd_detect(&mut cfg, apply),
+        Cmd::Add {
+            ssid,
+            password,
+            hidden,
+            to,
+            at,
+        } => cmd_add(&mut cfg, ssid, password, hidden, to, at),
+        Cmd::Forget { ssid } => cmd_forget(&mut cfg, &ssid),
+        Cmd::Scan { to } => cmd_scan(&mut cfg, to),
+        Cmd::List { show_passwords } => cmd_list(&cfg, show_passwords),
+        Cmd::Edit => cmd_edit(),
+        Cmd::Doctor { full } => cmd_doctor(&cfg, &cli.profile, full),
+        Cmd::InstallService { no_enable } => cmd_install_service(!no_enable),
+        Cmd::Cd { .. } => unreachable!(),
+    }
+}
+
+fn print_outcome(profile: &str, o: &flow::Outcome) {
+    match o {
+        flow::Outcome::Connected { ssid, note } => {
+            print!("{C_GREEN}connected{C_RESET} {C_BOLD}{ssid}{C_RESET} ({profile})");
+            match note {
+                Some(n) => println!(" {C_YELLOW}— {n}{C_RESET}"),
+                None => println!(),
+            }
+        }
+        flow::Outcome::TailscaleError { ssid, health } => {
+            println!(
+                "{C_RED}tailscale error{C_RESET}: {} {C_DIM}(on {}){C_RESET}",
+                health.describe(),
+                ssid.clone().unwrap_or_else(|| "—".into())
+            );
+        }
+        flow::Outcome::NoInterface => {
+            println!("{C_RED}no Wi-Fi adapter{C_RESET} — hardware issue")
+        }
+        flow::Outcome::NoNetworks => {
+            println!("{C_RED}no known networks in range{C_RESET} (profile {profile})")
+        }
+        flow::Outcome::UnknownProfile(p) => {
+            println!("{C_RED}unknown profile{C_RESET}: {p}")
+        }
+    }
+}
+
+fn cmd_status(cfg: &Config, override_p: &Option<String>) -> Result<i32, String> {
+    let p = active_profile(cfg, override_p);
+    let s = crate::status::gather(cfg, &p);
+
+    let dot = |ok: bool| {
+        if ok {
+            format!("{C_GREEN}●{C_RESET}")
+        } else {
+            format!("{C_RED}●{C_RESET}")
+        }
+    };
+
+    println!("{C_BOLD}breadcrumbs{C_RESET}");
+    println!("  profile     {C_BOLD}{p}{C_RESET}");
+    println!(
+        "  adapter     {}",
+        s.iface
+            .clone()
+            .unwrap_or_else(|| format!("{C_RED}none{C_RESET}"))
+    );
+    println!(
+        "  ssid        {}",
+        s.ssid
+            .clone()
+            .unwrap_or_else(|| format!("{C_DIM}—{C_RESET}"))
+    );
+    println!(
+        "  ip          {}",
+        s.ip.clone().unwrap_or_else(|| format!("{C_DIM}—{C_RESET}"))
+    );
+    println!(
+        "  internet    {} {}",
+        dot(s.internet),
+        if s.internet { "ok" } else { "down" }
+    );
+
+    match (&s.tailscale, s.tailscale_required) {
+        (Some(h), req) => {
+            let ok = h.is_ok();
+            println!(
+                "  tailscale   {} {} {C_DIM}(exit: {}{}){C_RESET}",
+                dot(ok || !req),
+                h.describe(),
+                s.exit_node,
+                if req { "" } else { ", optional" }
+            );
+        }
+        (None, _) => println!("  tailscale   {C_DIM}not installed{C_RESET}"),
+    }
+
+    let healthy = s.internet
+        && s.iface.is_some()
+        && (!s.tailscale_required || s.tailscale.as_ref().map(|h| h.is_ok()).unwrap_or(false));
+    println!(
+        "  state       {}",
+        if healthy {
+            format!("{C_GREEN}healthy{C_RESET}")
+        } else {
+            format!("{C_YELLOW}needs attention{C_RESET} — run `breadcrumbs init`")
+        }
+    );
+    Ok(if healthy { 0 } else { 1 })
+}
+
+fn cmd_profile(cfg: &mut Config, action: Option<ProfileCmd>) -> Result<i32, String> {
+    match action.unwrap_or(ProfileCmd::Get) {
+        ProfileCmd::Get => {
+            println!("{}", State::load(&cfg.settings.default_profile).profile);
+            Ok(0)
+        }
+        ProfileCmd::List => {
+            let cur = State::load(&cfg.settings.default_profile).profile;
+            for name in cfg.profiles.keys() {
+                let mark = if *name == cur { "*" } else { " " };
+                println!("{mark} {name}");
+            }
+            Ok(0)
+        }
+        ProfileCmd::Set { name, no_apply } => {
+            state::set_profile(cfg, &name)?;
+            println!("profile = {C_BOLD}{name}{C_RESET}");
+            if no_apply {
+                return Ok(0);
+            }
+            let outcome = flow::run(cfg, &name);
+            print_outcome(&name, &outcome);
+            Ok(if outcome.ok() { 0 } else { 1 })
+        }
+    }
+}
+
+fn detect_profile(cfg: &Config) -> Option<String> {
+    let iface = nm::wifi_interface()?;
+    nm::radio_on();
+    nm::rescan(&iface, &[]);
+    let visible = nm::visible_ssids(&iface);
+
+    // Profiles are stored in a BTreeMap so iteration order is deterministic
+    // (alphabetical). The caller can rely on that for tie-breaking.
+    for (name, profile) in &cfg.profiles {
+        if profile.detect_ssids.is_empty() {
+            continue;
+        }
+        if profile
+            .detect_ssids
+            .iter()
+            .any(|s| visible.contains(s.as_str()))
+        {
+            return Some(name.clone());
+        }
+    }
+
+    // Fall back to the default profile if no markers matched.
+    Some(cfg.settings.default_profile.clone())
+}
+
+fn cmd_detect(cfg: &mut Config, apply: bool) -> Result<i32, String> {
+    match detect_profile(cfg) {
+        Some(p) => {
+            println!("{p}");
+            if apply {
+                State {
+                    profile: p.clone(),
+                    updated: crate::util::timestamp(),
+                }
+                .save()?;
+                let outcome = flow::run(cfg, &p);
+                print_outcome(&p, &outcome);
+                return Ok(if outcome.ok() { 0 } else { 1 });
+            }
+            Ok(0)
+        }
+        None => Err("could not detect a profile (no Wi-Fi adapter?)".into()),
+    }
+}
+
+fn prompt_line(msg: &str) -> String {
+    print!("{msg}");
+    let _ = std::io::stdout().flush();
+    let mut s = String::new();
+    let _ = std::io::stdin().lock().read_line(&mut s);
+    s.trim_end_matches(['\n', '\r']).to_string()
+}
+
+/// An empty string entered for a password (CLI arg or a blank prompt
+/// response) means "this network has no password" (open Wi-Fi) — normalize
+/// it to `None` right at the point of entry so it flows the same way a
+/// genuinely absent/cleared password does. Without this, `Some("")` would
+/// make `nm::connect_verbose` treat it as a (blank) secret rather than an
+/// open network, and the connect fails against a real open SSID.
+fn non_empty(s: String) -> Option<String> {
+    if s.is_empty() {
+        None
+    } else {
+        Some(s)
+    }
+}
+
+fn prompt_secret(msg: &str) -> String {
+    // `util::run` redirects child stdin to /dev/null, so plain `stty -echo`
+    // would target the wrong fd and silently leave echo ON (leaking the
+    // password to the screen). `-F /dev/tty` makes stty act on the controlling
+    // terminal directly. If there is no tty we fall back to visible input.
+    let had_tty = util::run("stty", &["-F", "/dev/tty", "-echo"], Duration::from_secs(2)).success;
+    let val = prompt_line(msg);
+    if had_tty {
+        let _ = util::run("stty", &["-F", "/dev/tty", "echo"], Duration::from_secs(2));
+        println!();
+    }
+    val
+}
+
+fn cmd_add(
+    cfg: &mut Config,
+    ssid: String,
+    password: Option<String>,
+    hidden: bool,
+    to: Option<String>,
+    at: Option<usize>,
+) -> Result<i32, String> {
+    let password = match password {
+        Some(p) => p,
+        None => prompt_secret(&format!("Password for '{ssid}': ")),
+    };
+    let password = non_empty(password);
+    match cfg.networks.iter_mut().find(|n| n.ssid == ssid) {
+        Some(n) => {
+            n.password = password;
+            n.hidden = hidden || n.hidden;
+        }
+        None => cfg.networks.push(NetworkDef {
+            ssid: ssid.clone(),
+            password,
+            hidden,
+        }),
+    }
+    if let Some(prof_name) = to {
+        let prof = cfg
+            .profiles
+            .get_mut(&prof_name)
+            .ok_or_else(|| format!("unknown profile '{prof_name}'"))?;
+        prof.networks.retain(|s| s != &ssid);
+        let idx = at.unwrap_or(prof.networks.len()).min(prof.networks.len());
+        prof.networks.insert(idx, ssid.clone());
+    }
+    cfg.save()?;
+    println!("{C_GREEN}saved{C_RESET} {ssid}");
+    Ok(0)
+}
+
+fn cmd_forget(cfg: &mut Config, ssid: &str) -> Result<i32, String> {
+    let before = cfg.networks.len();
+    cfg.networks.retain(|n| n.ssid != ssid);
+    for p in cfg.profiles.values_mut() {
+        p.networks.retain(|s| s != ssid);
+        if p.bootstrap.as_deref() == Some(ssid) {
+            p.bootstrap = None;
+        }
+    }
+    cfg.save()?;
+    let removed = nm::delete_connections_for_ssid(ssid);
+    println!(
+        "{C_GREEN}forgot{C_RESET} {ssid} (config: {}, NetworkManager: {})",
+        if cfg.networks.len() < before {
+            "removed"
+        } else {
+            "not present"
+        },
+        if removed { "removed" } else { "not present" }
+    );
+    Ok(0)
+}
+
+fn cmd_scan(cfg: &mut Config, to: Option<String>) -> Result<i32, String> {
+    let iface = nm::wifi_interface().ok_or("no Wi-Fi adapter")?;
+    nm::radio_on();
+    nm::rescan(&iface, &[]);
+    let entries = nm::scan_list(&iface);
+    if entries.is_empty() {
+        return Err("no networks found".into());
+    }
+    for (i, e) in entries.iter().enumerate() {
+        println!(
+            "{:>2}. {C_BOLD}{}{C_RESET} {C_DIM}sig {}  {}{C_RESET}",
+            i + 1,
+            if e.ssid.is_empty() {
+                "<hidden>"
+            } else {
+                &e.ssid
+            },
+            e.signal,
+            e.security
+        );
+    }
+    let sel = prompt_line("Select number: ");
+    let idx: usize = sel
+        .parse::<usize>()
+        .ok()
+        .filter(|n| *n >= 1 && *n <= entries.len())
+        .ok_or("invalid selection")?;
+    let ssid = entries[idx - 1].ssid.clone();
+    if ssid.is_empty() {
+        return Err("cannot select a hidden SSID here; use `breadcrumbs add`".into());
+    }
+    let password = non_empty(prompt_secret(&format!("Password for '{ssid}': ")));
+    let mut def = NetworkDef {
+        ssid: ssid.clone(),
+        password,
+        hidden: false,
+    };
+    if !nm::connect(&iface, &def, cfg.settings.nmcli_wait, &cfg.settings.dns) {
+        return Err(format!("failed to connect to {ssid}"));
+    }
+    // A successful connect means NetworkManager now durably holds the PSK
+    // (either in a freshly created profile, or one whose PSK we just set) —
+    // breadcrumbs no longer needs to keep its own plaintext copy.
+    def.password = None;
+    match cfg.networks.iter_mut().find(|n| n.ssid == ssid) {
+        Some(n) => n.password = None,
+        None => cfg.networks.push(def),
+    }
+    if let Some(prof_name) = to {
+        if let Some(prof) = cfg.profiles.get_mut(&prof_name) {
+            if !prof.networks.contains(&ssid) {
+                prof.networks.push(ssid.clone());
+            }
+        }
+    }
+    cfg.save()?;
+    println!("{C_GREEN}connected + saved{C_RESET} {ssid}");
+    Ok(0)
+}
+
+/// Mask a secret for display. Operates on chars (not bytes) so multi-byte
+/// UTF-8 passwords don't panic on a mid-character byte slice, and never
+/// echoes back any real character of the secret (previously the first byte
+/// was shown unmasked).
+fn mask(p: &str) -> String {
+    "•".repeat(p.chars().count().max(2))
+}
+
+fn cmd_list(cfg: &Config, show_pw: bool) -> Result<i32, String> {
+    println!("{C_BOLD}settings{C_RESET}");
+    println!("  dns         {}", cfg.settings.dns);
+    println!("  exit_node   {}", cfg.settings.exit_node);
+    println!("  default     {}", cfg.settings.default_profile);
+    println!("  watch every {}s", cfg.settings.watch_interval);
+
+    println!("\n{C_BOLD}networks{C_RESET}");
+    for n in &cfg.networks {
+        let pw_display = match &n.password {
+            Some(p) if show_pw => p.clone(),
+            Some(p) => mask(p),
+            // No local secret: NetworkManager already owns the credential for
+            // this SSID, so there is nothing to mask — showing dots here
+            // would falsely imply breadcrumbs is still hiding a password.
+            None => format!("{C_DIM}managed by NetworkManager{C_RESET}"),
+        };
+        println!(
+            "  {C_BOLD}{}{C_RESET}  {C_DIM}{}{}{C_RESET}",
+            n.ssid,
+            pw_display,
+            if n.hidden { "  (hidden)" } else { "" }
+        );
+    }
+
+    println!("\n{C_BOLD}profiles{C_RESET}");
+    let cur = State::load(&cfg.settings.default_profile).profile;
+    for (name, p) in &cfg.profiles {
+        let mark = if *name == cur {
+            format!("{C_GREEN}*{C_RESET}")
+        } else {
+            " ".into()
+        };
+        println!("{mark} {C_BOLD}{name}{C_RESET}");
+        if let Some(b) = &p.bootstrap {
+            println!("    bootstrap   {b}");
+        }
+        if p.tailscale {
+            println!(
+                "    tailscale   required (exit: {})",
+                p.exit_node
+                    .clone()
+                    .unwrap_or_else(|| cfg.settings.exit_node.clone())
+            );
+        }
+        let mut order: Vec<String> = p.networks.clone();
+        if p.include_all_known {
+            order.push("…all other known networks".into());
+        }
+        println!("    priority    {}", order.join(" > "));
+    }
+    Ok(0)
+}
+
+fn cmd_edit() -> Result<i32, String> {
+    let editor = std::env::var("EDITOR").unwrap_or_else(|_| "nano".into());
+    let path = config::config_path();
+    let status = Command::new(&editor)
+        .arg(&path)
+        .status()
+        .map_err(|e| format!("launching {editor}: {e}"))?;
+    if !status.success() {
+        return Err("editor exited with error".into());
+    }
+    match Config::load() {
+        Ok(_) => {
+            println!("{C_GREEN}config OK{C_RESET}");
+            Ok(0)
+        }
+        Err(e) => Err(format!("config is now invalid: {e}")),
+    }
+}
+
+fn cmd_doctor(cfg: &Config, override_p: &Option<String>, full: bool) -> Result<i32, String> {
+    if full {
+        let script = config::config_dir().join("diag.sh");
+        if !script.exists() {
+            return Err(format!(
+                "diag.sh not found (expected at {})",
+                script.display()
+            ));
+        }
+        let st = Command::new("bash")
+            .arg(&script)
+            .status()
+            .map_err(|e| format!("running diag: {e}"))?;
+        return Ok(st.code().unwrap_or(1));
+    }
+
+    let p = active_profile(cfg, override_p);
+    let s = crate::status::gather(cfg, &p);
+    println!("{C_BOLD}breadcrumbs doctor{C_RESET}  (profile {p})");
+    println!(
+        "  nmcli       {}",
+        if command_exists("nmcli") {
+            "present"
+        } else {
+            "MISSING"
+        }
+    );
+    println!(
+        "  tailscale   {}",
+        if command_exists("tailscale") {
+            "present"
+        } else {
+            "absent"
+        }
+    );
+    println!(
+        "  adapter     {}",
+        s.iface.clone().unwrap_or_else(|| "none".into())
+    );
+    println!(
+        "  ssid        {}",
+        s.ssid.clone().unwrap_or_else(|| "—".into())
+    );
+    println!(
+        "  ip          {}",
+        s.ip.clone().unwrap_or_else(|| "—".into())
+    );
+    println!("  internet    {}", if s.internet { "ok" } else { "DOWN" });
+    if let Some(h) = &s.tailscale {
+        println!("  tailscale   {} (exit {})", h.describe(), s.exit_node);
+    }
+
+    if let Some(iface) = &s.iface {
+        let visible = nm::visible_ssids(iface);
+        let known: Vec<&str> = cfg
+            .networks
+            .iter()
+            .filter(|n| visible.contains(&n.ssid))
+            .map(|n| n.ssid.as_str())
+            .collect();
+        println!(
+            "  in range    {}",
+            if known.is_empty() {
+                "none of your saved networks".into()
+            } else {
+                known.join(", ")
+            }
+        );
+    }
+    println!("\nFull report: {C_DIM}breadcrumbs doctor --full{C_RESET}");
+    Ok(0)
+}
+
+fn cmd_cd(shell: bool) -> Result<i32, String> {
+    let dir = config::config_dir();
+    if shell {
+        let sh = std::env::var("SHELL").unwrap_or_else(|_| "/bin/sh".into());
+        let err = exec_replace(&sh, &dir);
+        return Err(err);
+    }
+    println!("{}", dir.display());
+    Ok(0)
+}
+
+/// Re-exec into an interactive login shell inside `dir`, replacing the
+/// current process. `dir` is passed as `$1` to the shell script rather than
+/// interpolated into the script text — the config dir can come from
+/// `$XDG_CONFIG_HOME`/`$HOME`, and string-formatting an arbitrary path
+/// straight into a `sh -c` command would let shell metacharacters (`$(...)`,
+/// backticks, etc.) in that path execute as commands.
+fn exec_replace(prog: &str, dir: &std::path::Path) -> String {
+    use std::os::unix::process::CommandExt;
+    let e = Command::new(prog)
+        .arg("-lc")
+        .arg("cd \"$1\" && exec \"$0\"")
+        .arg(prog)
+        .arg(dir)
+        .exec();
+    format!("exec {prog} failed: {e}")
+}
+
+fn cmd_install_service(enable: bool) -> Result<i32, String> {
+    let unit_dir = home_dir().join(".config/systemd/user");
+    std::fs::create_dir_all(&unit_dir)
+        .map_err(|e| format!("creating {}: {e}", unit_dir.display()))?;
+    let bin = std::env::current_exe().map_err(|e| format!("resolving current executable: {e}"))?;
+    // Ordering against graphical-session.target lets the watcher inherit the
+    // session's DISPLAY/WAYLAND_DISPLAY/DBUS so notify-send and the Tailscale
+    // login browser-open actually work. PATH is pinned because systemd --user
+    // units do not get the login shell's PATH, and the watcher shells out to
+    // nmcli/tailscale/sudo/xdg-open by name.
+    let unit = format!(
+        "[Unit]\n\
+         Description=breadcrumbs Wi-Fi state machine watcher\n\
+         After=network.target NetworkManager.service graphical-session.target\n\
+         Wants=network.target graphical-session.target\n\n\
+         [Service]\n\
+         Type=simple\n\
+         Environment=PATH=/usr/local/bin:/usr/bin:/bin\n\
+         ExecStart={bin} watch\n\
+         Restart=always\n\
+         RestartSec=5\n\
+         Nice=5\n\n\
+         [Install]\n\
+         WantedBy=default.target\n",
+        bin = bin.display()
+    );
+    let unit_path = unit_dir.join("breadcrumbs.service");
+    std::fs::write(&unit_path, unit)
+        .map_err(|e| format!("writing {}: {e}", unit_path.display()))?;
+    println!("{C_GREEN}wrote{C_RESET} {}", unit_path.display());
+
+    let _ = util::run(
+        "systemctl",
+        &["--user", "daemon-reload"],
+        Duration::from_secs(10),
+    );
+    if enable {
+        let o = util::run(
+            "systemctl",
+            &["--user", "enable", "--now", "breadcrumbs.service"],
+            Duration::from_secs(15),
+        );
+        if o.success {
+            println!("{C_GREEN}enabled + started{C_RESET} breadcrumbs.service");
+        } else {
+            println!(
+                "{C_YELLOW}unit installed{C_RESET}; enable failed: {}",
+                o.stderr.trim()
+            );
+            return Ok(1);
+        }
+    } else {
+        println!("Run: systemctl --user enable --now breadcrumbs.service");
+    }
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn mask_empty_password() {
+        // len() == 0 <= 2 branch: still at least 2 dots so an empty saved
+        // password doesn't visually collapse to nothing in `list`.
+        assert_eq!(mask(""), "••");
+    }
+
+    #[test]
+    fn mask_short_passwords_reveal_nothing() {
+        assert_eq!(mask("a"), "••");
+        assert_eq!(mask("ab"), "••");
+    }
+
+    #[test]
+    fn mask_never_echoes_a_real_character() {
+        let pw = "hunter2";
+        let masked = mask(pw);
+        assert_eq!(masked, "•".repeat(pw.len()));
+        assert!(!masked.contains('h'), "masked output leaked the first char");
+    }
+
+    #[test]
+    fn mask_multibyte_password_does_not_panic() {
+        // Regression test: the old byte-slicing `&p[..1]` panicked whenever
+        // the first character of the password was multi-byte UTF-8 (e.g. an
+        // emoji or accented character), since byte index 1 can land mid-char.
+        let pw = "日本語パスワード";
+        let masked = mask(pw);
+        assert_eq!(masked.chars().count(), pw.chars().count());
+        assert!(masked.chars().all(|c| c == '•'));
+    }
+
+    #[test]
+    fn mask_emoji_first_character_does_not_panic() {
+        let pw = "🔒password123";
+        let masked = mask(pw);
+        assert_eq!(masked.chars().count(), pw.chars().count());
+    }
+}

src/bread_events.rs

@@ -0,0 +1,97 @@
+//! `bread.crumbs.*` event integration — optional, non-blocking. See
+//! `EVENTS.md` at the repo root for the full contract. breadcrumbs works
+//! identically with or without breadd running; every call here is
+//! fire-and-forget (`BreadClient::emit` never blocks or errors this
+//! process) so a missing or restarting breadd never affects Wi-Fi
+//! automation itself.
+
+use bread_utils::bread_client::{BreadClient, BreadEvent};
+
+use crate::config::Config;
+use crate::state;
+
+/// This app's id in bread's sibling-app namespace registry
+/// (`bread_shared::apps::KNOWN_APPS`) — events publish as `bread.crumbs.*`,
+/// commands arrive on `bread.command.crumbs.*`.
+pub const APP_ID: &str = "crumbs";
+
+pub fn client() -> BreadClient {
+    BreadClient::connect(APP_ID)
+}
+
+pub fn emit_profile_changed(client: &BreadClient, from: &str, to: &str) {
+    client.emit(
+        "bread.crumbs.profile.changed",
+        serde_json::json!({ "from": from, "to": to }),
+    );
+}
+
+pub fn emit_health_changed(client: &BreadClient, profile: &str, health: &str, ssid: Option<&str>) {
+    client.emit(
+        "bread.crumbs.health.changed",
+        serde_json::json!({
+            "profile": profile,
+            "health": health,
+            "ssid": ssid,
+        }),
+    );
+}
+
+/// Reacts to `bread.command.crumbs.*` verbs. Only `set_profile` maps to
+/// real, existing breadcrumbs functionality today — there is no pin/select
+/// (or other) verb because breadcrumbs has no such concept. Unrecognized
+/// verbs are ignored, not stubbed as no-ops that pretend to succeed.
+///
+/// Returns `true` when a profile was actually persisted, so the watch loop
+/// can wake immediately and re-evaluate instead of waiting out the current
+/// poll interval.
+///
+/// Emits `bread.crumbs.set_profile.done`/`.failed` per the confirmation
+/// convention in bread's Documentation.md.
+pub fn handle_command(event: &BreadEvent) -> bool {
+    let Some(verb) = event.event.strip_prefix("bread.command.crumbs.") else {
+        return false;
+    };
+    match verb {
+        "set_profile" => handle_set_profile(event),
+        other => {
+            crate::notify::log(&format!(
+                "watch: ignoring unrecognized bread.command.crumbs.{other}"
+            ));
+            false
+        }
+    }
+}
+
+fn handle_set_profile(event: &BreadEvent) -> bool {
+    let Some(name) = event.data.get("profile").and_then(|v| v.as_str()) else {
+        emit_set_profile_failed("missing string \"profile\" in command data");
+        return false;
+    };
+    match Config::load().and_then(|cfg| state::set_profile(&cfg, name)) {
+        Ok(()) => {
+            crate::notify::log(&format!(
+                "watch: profile set via bread.command.crumbs.set_profile -> {name}"
+            ));
+            client().emit(
+                "bread.crumbs.set_profile.done",
+                serde_json::json!({ "profile": name }),
+            );
+            true
+        }
+        Err(e) => {
+            emit_set_profile_failed(&e);
+            false
+        }
+    }
+}
+
+fn emit_set_profile_failed(error: &str) {
+    crate::notify::log(&format!(
+        "watch: bread.command.crumbs.set_profile failed: {error}"
+    ));
+    client().emit(
+        "bread.crumbs.set_profile.failed",
+        serde_json::json!({ "error": error }),
+    );
+}

src/config.rs

@@ -63,7 +63,17 @@ impl Default for Settings {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct NetworkDef {
     pub ssid: String,
-    pub password: String,
+    /// A password is only needed once. On first successful connect,
+    /// NetworkManager durably saves the credential (a new connection
+    /// profile, or an updated PSK on an existing one); breadcrumbs then
+    /// clears this field and, on the next save, omits the key entirely
+    /// rather than writing a plaintext copy that's no longer needed. `None`
+    /// means either "NetworkManager already owns this secret" or "this is
+    /// an open (unsecured) network" — both cases behave the same way on
+    /// connect: no PSK is sent to nmcli at all. When `Some`, the PSK is
+    /// fed to `nmcli --ask` on stdin, never as an argv element.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub password: Option<String>,
     #[serde(default)]
     pub hidden: bool,
 }
@@ -95,12 +105,30 @@ pub struct Profile {
 pub struct Config {
     #[serde(default)]
     pub settings: Settings,
-    #[serde(default, rename = "networks")]
+    /// Saved networks (SSID + optional local password). Persisted to the
+    /// separate `networks.toml` file (see [`networks_path`]), not to
+    /// `breadcrumbs.toml` — kept here, and still deserialized from a
+    /// `[[networks]]` block if one is present in `breadcrumbs.toml`, purely
+    /// for backward compatibility with configs written before the secrets
+    /// split: an old-format file's inline networks load in on first read and
+    /// migrate to `networks.toml` automatically on the next `save()`, no
+    /// explicit migration step required.
+    #[serde(default, rename = "networks", skip_serializing)]
     pub networks: Vec<NetworkDef>,
     #[serde(default)]
     pub profiles: BTreeMap<String, Profile>,
 }
 
+/// The on-disk shape of `networks.toml`: just the `[[networks]]` array,
+/// split out of the main config so a file that's mostly just settings and
+/// profiles (the parts people actually hand-edit or dotfile) doesn't also
+/// carry whatever plaintext Wi-Fi credentials breadcrumbs still holds.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+struct NetworksFile {
+    #[serde(default, rename = "networks")]
+    networks: Vec<NetworkDef>,
+}
+
 pub fn config_dir() -> PathBuf {
     std::env::var_os("XDG_CONFIG_HOME")
         .map(PathBuf::from)
@@ -112,6 +140,13 @@ pub fn config_path() -> PathBuf {
     config_dir().join("breadcrumbs.toml")
 }
 
+/// Where saved networks (SSID + optional local password) live, split out of
+/// `breadcrumbs.toml`. Not meant to be hand-edited — managed via
+/// `breadcrumbs add` / `scan` / `forget`.
+pub fn networks_path() -> PathBuf {
+    config_dir().join("networks.toml")
+}
+
 pub fn state_dir() -> PathBuf {
     std::env::var_os("XDG_STATE_HOME")
         .map(PathBuf::from)
@@ -146,29 +181,69 @@ impl Config {
         }
         let text =
             fs::read_to_string(&path).map_err(|e| format!("reading {}: {e}", path.display()))?;
+        // May carry a legacy inline `[[networks]]` block (pre-split
+        // configs) — that's fine, see the field doc on `Config::networks`.
         let mut cfg: Config =
             toml::from_str(&text).map_err(|e| format!("parsing {}: {e}", path.display()))?;
+
+        let net_path = networks_path();
+        if net_path.exists() {
+            let net_text = fs::read_to_string(&net_path)
+                .map_err(|e| format!("reading {}: {e}", net_path.display()))?;
+            let nf: NetworksFile = toml::from_str(&net_text)
+                .map_err(|e| format!("parsing {}: {e}", net_path.display()))?;
+            cfg.networks = nf.networks;
+        }
+        // else: no networks.toml yet — keep whatever legacy inline networks
+        // were read from breadcrumbs.toml above (or none, on a genuinely
+        // fresh config). The next `save()` writes them to networks.toml and
+        // stops writing them into breadcrumbs.toml, completing the migration.
+
         // Self-heal: guarantee the three core profiles always exist.
         ensure_core_profiles(&mut cfg);
         Ok(cfg)
     }
 
+    /// Persist settings + profiles to `breadcrumbs.toml` and networks to the
+    /// separate `networks.toml`, both `0600`. Every mutating command (`add`,
+    /// `forget`, `scan`, `profile set`, and `flow::run`'s own credential
+    /// clearing) goes through this single method so the two files never
+    /// drift out of sync with each other.
     pub fn save(&self) -> Result<(), String> {
         let dir = config_dir();
         fs::create_dir_all(&dir).map_err(|e| format!("creating {}: {e}", dir.display()))?;
+
         let text = toml::to_string_pretty(self).map_err(|e| format!("serializing config: {e}"))?;
         let path = config_path();
         fs::write(&path, text).map_err(|e| format!("writing {}: {e}", path.display()))?;
-        // Plaintext Wi-Fi passwords live here — keep it owner-only.
-        #[cfg(unix)]
-        {
-            use std::os::unix::fs::PermissionsExt;
-            let _ = fs::set_permissions(&path, fs::Permissions::from_mode(0o600));
-        }
+        secure_permissions(&path);
+
+        let nf = NetworksFile {
+            networks: self.networks.clone(),
+        };
+        let net_text =
+            toml::to_string_pretty(&nf).map_err(|e| format!("serializing networks: {e}"))?;
+        let net_path = networks_path();
+        fs::write(&net_path, net_text)
+            .map_err(|e| format!("writing {}: {e}", net_path.display()))?;
+        secure_permissions(&net_path);
+
         Ok(())
     }
 }
 
+/// Any local Wi-Fi passwords still held (pre-first-connect, or a network
+/// breadcrumbs doesn't yet know NetworkManager owns) live in plaintext on
+/// disk — keep both config files owner-only. Best-effort: a failure here
+/// isn't fatal to saving the config itself.
+#[cfg(unix)]
+fn secure_permissions(path: &std::path::Path) {
+    use std::os::unix::fs::PermissionsExt;
+    let _ = fs::set_permissions(path, fs::Permissions::from_mode(0o600));
+}
+#[cfg(not(unix))]
+fn secure_permissions(_path: &std::path::Path) {}
+
 /// Initial skeleton networks generated for a brand-new installation.
 /// Passwords are intentionally blank — secrets never live in source.
 /// Users fill them via `breadcrumbs add`, `breadcrumbs scan`, or
@@ -274,4 +349,125 @@ mod tests {
         assert!(cfg.profile("work").is_some());
         assert!(cfg.profile("away").is_some());
     }
+
+    #[test]
+    fn ensure_core_profiles_preserves_user_customized_core_profile() {
+        // A user-edited "home" (custom SSIDs) must not be clobbered by the
+        // self-heal backfill — only genuinely *missing* core profiles should
+        // be inserted.
+        let mut profiles = BTreeMap::new();
+        profiles.insert(
+            "home".to_string(),
+            Profile {
+                networks: vec!["CustomSSID".into()],
+                ..Default::default()
+            },
+        );
+        let mut cfg = Config {
+            settings: Settings::default(),
+            networks: vec![],
+            profiles,
+        };
+        ensure_core_profiles(&mut cfg);
+        assert_eq!(
+            cfg.profile("home").unwrap().networks,
+            vec!["CustomSSID".to_string()]
+        );
+        // Still backfills the ones that were actually missing.
+        assert!(cfg.profile("work").is_some());
+        assert!(cfg.profile("away").is_some());
+    }
+
+    #[test]
+    fn settings_default_matches_documented_defaults() {
+        let s = Settings::default();
+        assert_eq!(s.dns, "1.1.1.1");
+        assert_eq!(s.nmcli_wait, 8);
+        assert_eq!(s.default_profile, "away");
+        assert_eq!(s.watch_interval, 12);
+        assert_eq!(s.ping_host, "1.1.1.1");
+        assert!(s.exit_node.is_empty());
+    }
+
+    #[test]
+    fn network_def_hidden_defaults_false_when_omitted() {
+        let text = r#"ssid = "Cafe"
+password = "pw""#;
+        let n: NetworkDef = toml::from_str(text).unwrap();
+        assert!(!n.hidden);
+    }
+
+    #[test]
+    fn network_def_password_defaults_to_none_when_key_absent() {
+        // No `password` key at all — e.g. a network whose secret breadcrumbs
+        // already cleared after NetworkManager took it over.
+        let text = r#"ssid = "Cafe"
+hidden = false"#;
+        let n: NetworkDef = toml::from_str(text).unwrap();
+        assert_eq!(n.password, None);
+    }
+
+    #[test]
+    fn network_def_omits_password_key_entirely_when_none() {
+        // Round-tripping a cleared password must not write `password = ""`
+        // (which would read back as "has an empty secret") or any other
+        // stand-in — the key should be gone, full stop.
+        let n = NetworkDef {
+            ssid: "Cafe".into(),
+            password: None,
+            hidden: false,
+        };
+        let text = toml::to_string_pretty(&n).unwrap();
+        assert!(!text.contains("password"), "text: {text}");
+    }
+
+    #[test]
+    fn network_def_password_round_trips_through_toml() {
+        let n = NetworkDef {
+            ssid: "Cafe".into(),
+            password: Some("hunter2".into()),
+            hidden: false,
+        };
+        let text = toml::to_string_pretty(&n).unwrap();
+        assert!(text.contains("hunter2"));
+        let back: NetworkDef = toml::from_str(&text).unwrap();
+        assert_eq!(back.password, Some("hunter2".to_string()));
+    }
+
+    // Note: `Config::save`/`Config::load`'s real filesystem behavior (the
+    // networks.toml split, and a cleared password actually landing on disk)
+    // is covered by `tests/cli.rs`'s Sandbox-isolated integration tests
+    // (`networks_are_stored_separately_from_settings_and_profiles`,
+    // `password_is_cleared_after_first_connect_and_never_sent_again`) rather
+    // than here — this module's tests stay pure per the project's test
+    // discipline (no real fs/env/subprocess access from a `#[cfg(test)]`
+    // unit test).
+
+    #[test]
+    fn profile_default_has_no_bootstrap_or_tailscale() {
+        let p = Profile::default();
+        assert!(p.bootstrap.is_none());
+        assert!(!p.tailscale);
+        assert!(!p.include_all_known);
+        assert!(p.networks.is_empty());
+        assert!(p.detect_ssids.is_empty());
+    }
+
+    #[test]
+    fn malformed_toml_fails_to_parse() {
+        let bad = "this is not [ valid toml";
+        assert!(toml::from_str::<Config>(bad).is_err());
+    }
+
+    #[test]
+    fn config_with_only_settings_defaults_networks_and_profiles() {
+        // A hand-written config that only sets `[settings]` shouldn't require
+        // `networks`/`profiles` sections — both must fall back to `#[serde(default)]`.
+        let text = r#"[settings]
+dns = "9.9.9.9""#;
+        let cfg: Config = toml::from_str(text).unwrap();
+        assert_eq!(cfg.settings.dns, "9.9.9.9");
+        assert!(cfg.networks.is_empty());
+        assert!(cfg.profiles.is_empty());
+    }
 }

src/flow.rs

@@ -27,25 +27,53 @@ impl Outcome {
     }
 }
 
-fn resolve_candidates<'a>(cfg: &'a Config, p: &crate::config::Profile) -> Vec<&'a NetworkDef> {
-    let mut out: Vec<&NetworkDef> = Vec::new();
+/// Resolve a profile's priority list to concrete network definitions.
+///
+/// Returns owned clones rather than borrows of `cfg` — small structs, and it
+/// decouples the result's lifetime from `cfg` so callers (namely [`run`]) can
+/// still mutate `cfg` (to clear a used password and persist it) while a
+/// candidate from this list is being acted on.
+fn resolve_candidates(cfg: &Config, p: &crate::config::Profile) -> Vec<NetworkDef> {
+    let mut out: Vec<NetworkDef> = Vec::new();
     for ssid in &p.networks {
         if let Some(def) = cfg.network(ssid) {
             if !out.iter().any(|d| d.ssid == def.ssid) {
-                out.push(def);
+                out.push(def.clone());
             }
         }
     }
     if p.include_all_known {
         for def in &cfg.networks {
             if !out.iter().any(|d| d.ssid == def.ssid) {
-                out.push(def);
+                out.push(def.clone());
             }
         }
     }
     out
 }
 
+/// A network was just connected to using a local password, and NetworkManager
+/// now durably holds that secret — either in a freshly created connection
+/// profile (`device wifi connect --ask`) or an existing one whose PSK we just
+/// supplied via `--ask connection up`. Either way breadcrumbs no longer needs
+/// its own plaintext copy: clear it and persist immediately so it doesn't sit
+/// on disk any longer than necessary. A no-op (no save) if the network has no
+/// local password to begin with.
+fn clear_password_if_used(cfg: &mut Config, ssid: &str) {
+    let Some(def) = cfg.networks.iter_mut().find(|n| n.ssid == ssid) else {
+        return;
+    };
+    if def.password.is_none() {
+        return;
+    }
+    def.password = None;
+    if let Err(e) = cfg.save() {
+        log(&format!(
+            "failed to persist cleared password for {ssid}: {e}"
+        ));
+    }
+}
+
 /// Try to connect + confirm it actually carries traffic.
 /// Returns Ok(()) on success, Err(reason) on failure.
 fn connect_and_verify(iface: &str, def: &NetworkDef, cfg: &Config) -> Result<(), String> {
@@ -57,7 +85,13 @@ fn connect_and_verify(iface: &str, def: &NetworkDef, cfg: &Config) -> Result<(),
 }
 
 /// Run the connection state machine for `profile_name`.
-pub fn run(cfg: &Config, profile_name: &str) -> Outcome {
+///
+/// Takes `cfg` mutably: a successful connect that used a local password
+/// clears that network's `password` field and persists the config
+/// immediately (see [`clear_password_if_used`]) — this is the only way that
+/// clearing happens for the `init` / `profile set --apply` / `detect --apply`
+/// commands and the watch loop, all of which route through here.
+pub fn run(cfg: &mut Config, profile_name: &str) -> Outcome {
     let profile = match cfg.profile(profile_name) {
         Some(p) => p.clone(),
         None => {
@@ -111,15 +145,20 @@ pub fn run(cfg: &Config, profile_name: &str) -> Outcome {
     let mut on_bootstrap = false;
     if profile.tailscale {
         if let Some(bs_ssid) = profile.bootstrap.clone() {
-            match cfg.network(&bs_ssid) {
+            // Owned clone (not a borrow of `cfg`) so we're free to mutate
+            // `cfg` below on a successful connect.
+            match cfg.network(&bs_ssid).cloned() {
                 Some(bdef) => {
                     if visible.contains(&bdef.ssid) || bdef.hidden {
-                        match connect_and_verify(&iface, bdef, cfg) {
+                        match connect_and_verify(&iface, &bdef, cfg) {
                             Ok(()) => {
                                 on_bootstrap = true;
                                 log(&format!("bootstrap connected: {}", bdef.ssid));
+                                clear_password_if_used(cfg, &bdef.ssid);
+                            }
+                            Err(e) => {
+                                log(&format!("bootstrap connect failed: {} — {e}", bdef.ssid))
                             }
-                            Err(e) => log(&format!("bootstrap connect failed: {} — {e}", bdef.ssid)),
                         }
                     } else {
                         log(&format!("bootstrap not in range: {}", bdef.ssid));
@@ -160,6 +199,7 @@ pub fn run(cfg: &Config, profile_name: &str) -> Outcome {
             any_attempted = true;
             match connect_and_verify(&iface, def, cfg) {
                 Ok(()) => {
+                    clear_password_if_used(cfg, &def.ssid);
                     let note = if internet_ok(cfg) {
                         None
                     } else {
@@ -181,6 +221,7 @@ pub fn run(cfg: &Config, profile_name: &str) -> Outcome {
             any_attempted = true;
             match connect_and_verify(&iface, def, cfg) {
                 Ok(()) => {
+                    clear_password_if_used(cfg, &def.ssid);
                     let note = if internet_ok(cfg) {
                         None
                     } else {
@@ -206,9 +247,18 @@ pub fn run(cfg: &Config, profile_name: &str) -> Outcome {
             .clone()
             .unwrap_or_else(|| "bootstrap".into());
         if !nm::device_connected(&iface) {
-            if let Some(bdef) = profile.bootstrap.as_deref().and_then(|s| cfg.network(s)) {
-                match connect_and_verify(&iface, bdef, cfg) {
-                    Ok(()) => log(&format!("bootstrap reconnected: {}", bdef.ssid)),
+            // Owned clone (not a borrow of `cfg`) so a successful reconnect
+            // is free to mutate `cfg` to clear the used password.
+            if let Some(bdef) = profile
+                .bootstrap
+                .as_deref()
+                .and_then(|s| cfg.network(s).cloned())
+            {
+                match connect_and_verify(&iface, &bdef, cfg) {
+                    Ok(()) => {
+                        log(&format!("bootstrap reconnected: {}", bdef.ssid));
+                        clear_password_if_used(cfg, &bdef.ssid);
+                    }
                     Err(e) => {
                         log(&format!("bootstrap reconnect failed: {} — {e}", bdef.ssid));
                         on_bootstrap = false;
@@ -279,7 +329,7 @@ mod tests {
     fn net(ssid: &str) -> NetworkDef {
         NetworkDef {
             ssid: ssid.into(),
-            password: "x".into(),
+            password: Some("x".into()),
             hidden: false,
         }
     }
@@ -304,10 +354,8 @@ mod tests {
             networks: vec!["FallbackNet".into(), "HomeWifi".into()],
             ..Default::default()
         };
-        let got: Vec<&str> = resolve_candidates(&c, &p)
-            .iter()
-            .map(|n| n.ssid.as_str())
-            .collect();
+        let candidates = resolve_candidates(&c, &p);
+        let got: Vec<&str> = candidates.iter().map(|n| n.ssid.as_str()).collect();
         assert_eq!(got, vec!["FallbackNet", "HomeWifi"]);
     }
 
@@ -319,10 +367,8 @@ mod tests {
             include_all_known: true,
             ..Default::default()
         };
-        let got: Vec<&str> = resolve_candidates(&c, &p)
-            .iter()
-            .map(|n| n.ssid.as_str())
-            .collect();
+        let candidates = resolve_candidates(&c, &p);
+        let got: Vec<&str> = candidates.iter().map(|n| n.ssid.as_str()).collect();
         assert_eq!(got[0], "HomeWifi");
         assert_eq!(got.len(), 4);
         assert!(got.contains(&"WorkNet"));
@@ -337,10 +383,71 @@ mod tests {
             networks: vec!["Ghost".into(), "WorkNet".into()],
             ..Default::default()
         };
-        let got: Vec<&str> = resolve_candidates(&c, &p)
-            .iter()
-            .map(|n| n.ssid.as_str())
-            .collect();
+        let candidates = resolve_candidates(&c, &p);
+        let got: Vec<&str> = candidates.iter().map(|n| n.ssid.as_str()).collect();
         assert_eq!(got, vec!["WorkNet"]);
     }
+
+    #[test]
+    fn empty_profile_network_list_yields_no_candidates() {
+        let c = cfg();
+        let p = Profile::default();
+        assert!(resolve_candidates(&c, &p).is_empty());
+    }
+
+    #[test]
+    fn duplicate_ssids_within_profile_list_are_deduped() {
+        let c = cfg();
+        let p = Profile {
+            networks: vec!["HomeWifi".into(), "HomeWifi".into(), "WorkNet".into()],
+            ..Default::default()
+        };
+        let candidates = resolve_candidates(&c, &p);
+        let got: Vec<&str> = candidates.iter().map(|n| n.ssid.as_str()).collect();
+        assert_eq!(got, vec!["HomeWifi", "WorkNet"]);
+    }
+
+    #[test]
+    fn include_all_known_with_full_priority_list_appends_nothing_new() {
+        let c = cfg();
+        let p = Profile {
+            networks: vec![
+                "HomeWifi".into(),
+                "WorkNet".into(),
+                "CafeWifi".into(),
+                "FallbackNet".into(),
+            ],
+            include_all_known: true,
+            ..Default::default()
+        };
+        let got = resolve_candidates(&c, &p);
+        assert_eq!(got.len(), 4);
+    }
+
+    #[test]
+    fn include_all_known_on_empty_priority_list_returns_all_networks() {
+        let c = cfg();
+        let p = Profile {
+            include_all_known: true,
+            ..Default::default()
+        };
+        assert_eq!(resolve_candidates(&c, &p).len(), 4);
+    }
+
+    #[test]
+    fn outcome_ok_is_true_only_for_connected() {
+        assert!(Outcome::Connected {
+            ssid: "x".into(),
+            note: None
+        }
+        .ok());
+        assert!(!Outcome::NoInterface.ok());
+        assert!(!Outcome::NoNetworks.ok());
+        assert!(!Outcome::UnknownProfile("ghost".into()).ok());
+        assert!(!Outcome::TailscaleError {
+            ssid: None,
+            health: crate::tailscale::TsHealth::NotInstalled
+        }
+        .ok());
+    }
 }

src/lib.rs

@@ -0,0 +1,20 @@
+//! breadcrumbs library crate.
+//!
+//! All actual logic lives here; `src/main.rs` is a thin binary shim that
+//! parses no arguments itself — it just calls [`app::run`]. Splitting things
+//! this way means integration tests can link against `breadcrumbs` as an
+//! ordinary library crate and drive the real state machine (`flow::run`,
+//! `watch::classify`, …) in-process, instead of only being able to spawn the
+//! compiled binary.
+
+pub mod app;
+pub mod bread_events;
+pub mod config;
+pub mod flow;
+pub mod nm;
+pub mod notify;
+pub mod state;
+pub mod status;
+pub mod tailscale;
+pub mod util;
+pub mod watch;

src/main.rs

@@ -1,721 +1,7 @@
-mod config;
-mod flow;
-mod nm;
-mod notify;
-mod state;
-mod status;
-mod tailscale;
-mod util;
-mod watch;
-
-use std::io::{BufRead, Write};
-use std::process::Command;
-use std::time::Duration;
-
-use clap::{Parser, Subcommand};
-
-use config::{Config, NetworkDef};
-use state::State;
-use util::{command_exists, home_dir, run};
-
-const C_RESET: &str = "\x1b[0m";
-const C_BOLD: &str = "\x1b[1m";
-const C_GREEN: &str = "\x1b[32m";
-const C_RED: &str = "\x1b[31m";
-const C_YELLOW: &str = "\x1b[33m";
-const C_DIM: &str = "\x1b[2m";
-
-#[derive(Parser)]
-#[command(
-    name = "breadcrumbs",
-    version,
-    about = "Profile-aware Wi-Fi state machine with Tailscale handling",
-    disable_help_subcommand = true
-)]
-struct Cli {
-    /// Override the active profile for this run only (does not persist)
-    #[arg(long, short, global = true)]
-    profile: Option<String>,
-
-    #[command(subcommand)]
-    cmd: Option<Cmd>,
-}
-
-#[derive(Subcommand)]
-enum Cmd {
-    /// Show current Wi-Fi / profile / Tailscale status (default)
-    Status,
-    /// Run the full connect sequence for the active profile
-    #[command(visible_aliases = ["up", "connect", "i"])]
-    Init,
-    /// Run as a daemon: watch for drops and auto-recover
-    Watch {
-        /// Skip the connect attempt on startup
-        #[arg(long)]
-        no_initial: bool,
-    },
-    /// Get / set / list location profiles (the state machine)
-    Profile {
-        #[command(subcommand)]
-        action: Option<ProfileCmd>,
-    },
-    /// Guess the profile from visible networks
-    Detect {
-        /// Set + apply the detected profile
-        #[arg(long)]
-        apply: bool,
-    },
-    /// Add or update a saved network
-    Add {
-        ssid: String,
-        /// Password (prompted if omitted)
-        password: Option<String>,
-        /// Network is hidden (does not broadcast its SSID)
-        #[arg(long)]
-        hidden: bool,
-        /// Attach this SSID to a profile's priority list
-        #[arg(long)]
-        to: Option<String>,
-        /// Position in the profile list (0 = highest priority)
-        #[arg(long)]
-        at: Option<usize>,
-    },
-    /// Remove a saved network (config + NetworkManager)
-    Forget { ssid: String },
-    /// Scan, pick, connect and save a network interactively
-    Scan {
-        /// Attach the saved network to this profile
-        #[arg(long)]
-        to: Option<String>,
-    },
-    /// List configured networks and profiles
-    List {
-        #[arg(long)]
-        show_passwords: bool,
-    },
-    /// Open the config file in $EDITOR
-    Edit,
-    /// Quick connectivity / Tailscale diagnostics
-    Doctor {
-        /// Run the full diag.sh report from the config directory
-        #[arg(long)]
-        full: bool,
-    },
-    /// Print the breadcrumbs config directory
-    Cd {
-        #[arg(long)]
-        shell: bool,
-    },
-    /// Install + enable the systemd user watcher service
-    InstallService {
-        /// Install the unit but do not enable/start it
-        #[arg(long)]
-        no_enable: bool,
-    },
-}
-
-#[derive(Subcommand)]
-enum ProfileCmd {
-    /// Print the active profile
-    Get,
-    /// Set the active profile (and apply it unless --no-apply)
-    Set {
-        name: String,
-        #[arg(long)]
-        no_apply: bool,
-    },
-    /// List available profiles
-    List,
-}
+//! Thin binary entry point. All argument parsing and command logic lives in
+//! the library crate (`breadcrumbs::app`) so it can also be exercised
+//! in-process by the integration tests under `tests/`.
 
 fn main() {
-    let cli = Cli::parse();
-    let code = match real_main(cli) {
-        Ok(c) => c,
-        Err(e) => {
-            eprintln!("{C_RED}error:{C_RESET} {e}");
-            1
-        }
-    };
-    std::process::exit(code);
-}
-
-fn active_profile(cfg: &Config, override_p: &Option<String>) -> String {
-    if let Some(p) = override_p {
-        return p.clone();
-    }
-    State::load(&cfg.settings.default_profile).profile
-}
-
-fn real_main(cli: Cli) -> Result<i32, String> {
-    let cmd = cli.cmd.unwrap_or(Cmd::Status);
-
-    // `cd` and `install-service` don't need a parsed config first.
-    if let Cmd::Cd { shell } = &cmd {
-        return cmd_cd(*shell);
-    }
-
-    let mut cfg = Config::load()?;
-
-    match cmd {
-        Cmd::Status => cmd_status(&cfg, &cli.profile),
-        Cmd::Init => {
-            let p = active_profile(&cfg, &cli.profile);
-            let outcome = flow::run(&cfg, &p);
-            print_outcome(&p, &outcome);
-            Ok(if outcome.ok() { 0 } else { 1 })
-        }
-        Cmd::Watch { no_initial } => Ok(watch::run(cfg, !no_initial)),
-        Cmd::Profile { action } => cmd_profile(&cfg, action),
-        Cmd::Detect { apply } => cmd_detect(&cfg, apply),
-        Cmd::Add {
-            ssid,
-            password,
-            hidden,
-            to,
-            at,
-        } => cmd_add(&mut cfg, ssid, password, hidden, to, at),
-        Cmd::Forget { ssid } => cmd_forget(&mut cfg, &ssid),
-        Cmd::Scan { to } => cmd_scan(&mut cfg, to),
-        Cmd::List { show_passwords } => cmd_list(&cfg, show_passwords),
-        Cmd::Edit => cmd_edit(),
-        Cmd::Doctor { full } => cmd_doctor(&cfg, &cli.profile, full),
-        Cmd::InstallService { no_enable } => cmd_install_service(!no_enable),
-        Cmd::Cd { .. } => unreachable!(),
-    }
-}
-
-fn print_outcome(profile: &str, o: &flow::Outcome) {
-    match o {
-        flow::Outcome::Connected { ssid, note } => {
-            print!("{C_GREEN}connected{C_RESET} {C_BOLD}{ssid}{C_RESET} ({profile})");
-            match note {
-                Some(n) => println!(" {C_YELLOW}— {n}{C_RESET}"),
-                None => println!(),
-            }
-        }
-        flow::Outcome::TailscaleError { ssid, health } => {
-            println!(
-                "{C_RED}tailscale error{C_RESET}: {} {C_DIM}(on {}){C_RESET}",
-                health.describe(),
-                ssid.clone().unwrap_or_else(|| "—".into())
-            );
-        }
-        flow::Outcome::NoInterface => {
-            println!("{C_RED}no Wi-Fi adapter{C_RESET} — hardware issue")
-        }
-        flow::Outcome::NoNetworks => {
-            println!("{C_RED}no known networks in range{C_RESET} (profile {profile})")
-        }
-        flow::Outcome::UnknownProfile(p) => {
-            println!("{C_RED}unknown profile{C_RESET}: {p}")
-        }
-    }
-}
-
-fn cmd_status(cfg: &Config, override_p: &Option<String>) -> Result<i32, String> {
-    let p = active_profile(cfg, override_p);
-    let s = status::gather(cfg, &p);
-
-    let dot = |ok: bool| {
-        if ok {
-            format!("{C_GREEN}●{C_RESET}")
-        } else {
-            format!("{C_RED}●{C_RESET}")
-        }
-    };
-
-    println!("{C_BOLD}breadcrumbs{C_RESET}");
-    println!("  profile     {C_BOLD}{p}{C_RESET}");
-    println!(
-        "  adapter     {}",
-        s.iface
-            .clone()
-            .unwrap_or_else(|| format!("{C_RED}none{C_RESET}"))
-    );
-    println!(
-        "  ssid        {}",
-        s.ssid
-            .clone()
-            .unwrap_or_else(|| format!("{C_DIM}—{C_RESET}"))
-    );
-    println!(
-        "  ip          {}",
-        s.ip.clone().unwrap_or_else(|| format!("{C_DIM}—{C_RESET}"))
-    );
-    println!(
-        "  internet    {} {}",
-        dot(s.internet),
-        if s.internet { "ok" } else { "down" }
-    );
-
-    match (&s.tailscale, s.tailscale_required) {
-        (Some(h), req) => {
-            let ok = h.is_ok();
-            println!(
-                "  tailscale   {} {} {C_DIM}(exit: {}{}){C_RESET}",
-                dot(ok || !req),
-                h.describe(),
-                s.exit_node,
-                if req { "" } else { ", optional" }
-            );
-        }
-        (None, _) => println!("  tailscale   {C_DIM}not installed{C_RESET}"),
-    }
-
-    let healthy = s.internet
-        && s.iface.is_some()
-        && (!s.tailscale_required || s.tailscale.as_ref().map(|h| h.is_ok()).unwrap_or(false));
-    println!(
-        "  state       {}",
-        if healthy {
-            format!("{C_GREEN}healthy{C_RESET}")
-        } else {
-            format!("{C_YELLOW}needs attention{C_RESET} — run `breadcrumbs init`")
-        }
-    );
-    Ok(if healthy { 0 } else { 1 })
-}
-
-fn cmd_profile(cfg: &Config, action: Option<ProfileCmd>) -> Result<i32, String> {
-    match action.unwrap_or(ProfileCmd::Get) {
-        ProfileCmd::Get => {
-            println!("{}", State::load(&cfg.settings.default_profile).profile);
-            Ok(0)
-        }
-        ProfileCmd::List => {
-            let cur = State::load(&cfg.settings.default_profile).profile;
-            for name in cfg.profiles.keys() {
-                let mark = if *name == cur { "*" } else { " " };
-                println!("{mark} {name}");
-            }
-            Ok(0)
-        }
-        ProfileCmd::Set { name, no_apply } => {
-            if !cfg.profiles.contains_key(&name) {
-                let avail: Vec<&String> = cfg.profiles.keys().collect();
-                return Err(format!("unknown profile '{name}'. Available: {avail:?}"));
-            }
-            let st = State {
-                profile: name.clone(),
-                updated: util::timestamp(),
-            };
-            st.save()?;
-            notify::log(&format!("profile set -> {name}"));
-            println!("profile = {C_BOLD}{name}{C_RESET}");
-            if no_apply {
-                return Ok(0);
-            }
-            let outcome = flow::run(cfg, &name);
-            print_outcome(&name, &outcome);
-            Ok(if outcome.ok() { 0 } else { 1 })
-        }
-    }
-}
-
-fn detect_profile(cfg: &Config) -> Option<String> {
-    let iface = nm::wifi_interface()?;
-    nm::radio_on();
-    nm::rescan(&iface, &[]);
-    let visible = nm::visible_ssids(&iface);
-
-    // Profiles are stored in a BTreeMap so iteration order is deterministic
-    // (alphabetical). The caller can rely on that for tie-breaking.
-    for (name, profile) in &cfg.profiles {
-        if profile.detect_ssids.is_empty() {
-            continue;
-        }
-        if profile
-            .detect_ssids
-            .iter()
-            .any(|s| visible.contains(s.as_str()))
-        {
-            return Some(name.clone());
-        }
-    }
-
-    // Fall back to the default profile if no markers matched.
-    Some(cfg.settings.default_profile.clone())
-}
-
-fn cmd_detect(cfg: &Config, apply: bool) -> Result<i32, String> {
-    match detect_profile(cfg) {
-        Some(p) => {
-            println!("{p}");
-            if apply {
-                State {
-                    profile: p.clone(),
-                    updated: util::timestamp(),
-                }
-                .save()?;
-                let outcome = flow::run(cfg, &p);
-                print_outcome(&p, &outcome);
-                return Ok(if outcome.ok() { 0 } else { 1 });
-            }
-            Ok(0)
-        }
-        None => Err("could not detect a profile (no Wi-Fi adapter?)".into()),
-    }
-}
-
-fn prompt_line(msg: &str) -> String {
-    print!("{msg}");
-    let _ = std::io::stdout().flush();
-    let mut s = String::new();
-    let _ = std::io::stdin().lock().read_line(&mut s);
-    s.trim_end_matches(['\n', '\r']).to_string()
-}
-
-fn prompt_secret(msg: &str) -> String {
-    // `util::run` redirects child stdin to /dev/null, so plain `stty -echo`
-    // would target the wrong fd and silently leave echo ON (leaking the
-    // password to the screen). `-F /dev/tty` makes stty act on the controlling
-    // terminal directly. If there is no tty we fall back to visible input.
-    let had_tty = run("stty", &["-F", "/dev/tty", "-echo"], Duration::from_secs(2)).success;
-    let val = prompt_line(msg);
-    if had_tty {
-        let _ = run("stty", &["-F", "/dev/tty", "echo"], Duration::from_secs(2));
-        println!();
-    }
-    val
-}
-
-fn cmd_add(
-    cfg: &mut Config,
-    ssid: String,
-    password: Option<String>,
-    hidden: bool,
-    to: Option<String>,
-    at: Option<usize>,
-) -> Result<i32, String> {
-    let password = match password {
-        Some(p) => p,
-        None => prompt_secret(&format!("Password for '{ssid}': ")),
-    };
-    match cfg.networks.iter_mut().find(|n| n.ssid == ssid) {
-        Some(n) => {
-            n.password = password;
-            n.hidden = hidden || n.hidden;
-        }
-        None => cfg.networks.push(NetworkDef {
-            ssid: ssid.clone(),
-            password,
-            hidden,
-        }),
-    }
-    if let Some(prof_name) = to {
-        let prof = cfg
-            .profiles
-            .get_mut(&prof_name)
-            .ok_or_else(|| format!("unknown profile '{prof_name}'"))?;
-        prof.networks.retain(|s| s != &ssid);
-        let idx = at.unwrap_or(prof.networks.len()).min(prof.networks.len());
-        prof.networks.insert(idx, ssid.clone());
-    }
-    cfg.save()?;
-    println!("{C_GREEN}saved{C_RESET} {ssid}");
-    Ok(0)
-}
-
-fn cmd_forget(cfg: &mut Config, ssid: &str) -> Result<i32, String> {
-    let before = cfg.networks.len();
-    cfg.networks.retain(|n| n.ssid != ssid);
-    for p in cfg.profiles.values_mut() {
-        p.networks.retain(|s| s != ssid);
-        if p.bootstrap.as_deref() == Some(ssid) {
-            p.bootstrap = None;
-        }
-    }
-    cfg.save()?;
-    let removed = nm::delete_connections_for_ssid(ssid);
-    println!(
-        "{C_GREEN}forgot{C_RESET} {ssid} (config: {}, NetworkManager: {})",
-        if cfg.networks.len() < before {
-            "removed"
-        } else {
-            "not present"
-        },
-        if removed { "removed" } else { "not present" }
-    );
-    Ok(0)
-}
-
-fn cmd_scan(cfg: &mut Config, to: Option<String>) -> Result<i32, String> {
-    let iface = nm::wifi_interface().ok_or("no Wi-Fi adapter")?;
-    nm::radio_on();
-    nm::rescan(&iface, &[]);
-    let entries = nm::scan_list(&iface);
-    if entries.is_empty() {
-        return Err("no networks found".into());
-    }
-    for (i, e) in entries.iter().enumerate() {
-        println!(
-            "{:>2}. {C_BOLD}{}{C_RESET} {C_DIM}sig {}  {}{C_RESET}",
-            i + 1,
-            if e.ssid.is_empty() {
-                "<hidden>"
-            } else {
-                &e.ssid
-            },
-            e.signal,
-            e.security
-        );
-    }
-    let sel = prompt_line("Select number: ");
-    let idx: usize = sel
-        .parse::<usize>()
-        .ok()
-        .filter(|n| *n >= 1 && *n <= entries.len())
-        .ok_or("invalid selection")?;
-    let ssid = entries[idx - 1].ssid.clone();
-    if ssid.is_empty() {
-        return Err("cannot select a hidden SSID here; use `breadcrumbs add`".into());
-    }
-    let password = prompt_secret(&format!("Password for '{ssid}': "));
-    let def = NetworkDef {
-        ssid: ssid.clone(),
-        password: password.clone(),
-        hidden: false,
-    };
-    if !nm::connect(&iface, &def, cfg.settings.nmcli_wait, &cfg.settings.dns) {
-        return Err(format!("failed to connect to {ssid}"));
-    }
-    match cfg.networks.iter_mut().find(|n| n.ssid == ssid) {
-        Some(n) => n.password = password,
-        None => cfg.networks.push(def),
-    }
-    if let Some(prof_name) = to {
-        if let Some(prof) = cfg.profiles.get_mut(&prof_name) {
-            if !prof.networks.contains(&ssid) {
-                prof.networks.push(ssid.clone());
-            }
-        }
-    }
-    cfg.save()?;
-    println!("{C_GREEN}connected + saved{C_RESET} {ssid}");
-    Ok(0)
-}
-
-fn mask(p: &str) -> String {
-    if p.len() <= 2 {
-        "••".into()
-    } else {
-        format!("{}{}", &p[..1], "•".repeat(p.len().saturating_sub(1)))
-    }
-}
-
-fn cmd_list(cfg: &Config, show_pw: bool) -> Result<i32, String> {
-    println!("{C_BOLD}settings{C_RESET}");
-    println!("  dns         {}", cfg.settings.dns);
-    println!("  exit_node   {}", cfg.settings.exit_node);
-    println!("  default     {}", cfg.settings.default_profile);
-    println!("  watch every {}s", cfg.settings.watch_interval);
-
-    println!("\n{C_BOLD}networks{C_RESET}");
-    for n in &cfg.networks {
-        println!(
-            "  {C_BOLD}{}{C_RESET}  {C_DIM}{}{}{C_RESET}",
-            n.ssid,
-            if show_pw {
-                n.password.clone()
-            } else {
-                mask(&n.password)
-            },
-            if n.hidden { "  (hidden)" } else { "" }
-        );
-    }
-
-    println!("\n{C_BOLD}profiles{C_RESET}");
-    let cur = State::load(&cfg.settings.default_profile).profile;
-    for (name, p) in &cfg.profiles {
-        let mark = if *name == cur {
-            format!("{C_GREEN}*{C_RESET}")
-        } else {
-            " ".into()
-        };
-        println!("{mark} {C_BOLD}{name}{C_RESET}");
-        if let Some(b) = &p.bootstrap {
-            println!("    bootstrap   {b}");
-        }
-        if p.tailscale {
-            println!(
-                "    tailscale   required (exit: {})",
-                p.exit_node
-                    .clone()
-                    .unwrap_or_else(|| cfg.settings.exit_node.clone())
-            );
-        }
-        let mut order: Vec<String> = p.networks.clone();
-        if p.include_all_known {
-            order.push("…all other known networks".into());
-        }
-        println!("    priority    {}", order.join(" > "));
-    }
-    Ok(0)
-}
-
-fn cmd_edit() -> Result<i32, String> {
-    let editor = std::env::var("EDITOR").unwrap_or_else(|_| "nano".into());
-    let path = config::config_path();
-    let status = Command::new(&editor)
-        .arg(&path)
-        .status()
-        .map_err(|e| format!("launching {editor}: {e}"))?;
-    if !status.success() {
-        return Err("editor exited with error".into());
-    }
-    match Config::load() {
-        Ok(_) => {
-            println!("{C_GREEN}config OK{C_RESET}");
-            Ok(0)
-        }
-        Err(e) => Err(format!("config is now invalid: {e}")),
-    }
-}
-
-fn cmd_doctor(cfg: &Config, override_p: &Option<String>, full: bool) -> Result<i32, String> {
-    if full {
-        let script = config::config_dir().join("diag.sh");
-        if !script.exists() {
-            return Err(format!(
-                "diag.sh not found (expected at {})",
-                script.display()
-            ));
-        }
-        let st = Command::new("bash")
-            .arg(&script)
-            .status()
-            .map_err(|e| format!("running diag: {e}"))?;
-        return Ok(st.code().unwrap_or(1));
-    }
-
-    let p = active_profile(cfg, override_p);
-    let s = status::gather(cfg, &p);
-    println!("{C_BOLD}breadcrumbs doctor{C_RESET}  (profile {p})");
-    println!(
-        "  nmcli       {}",
-        if command_exists("nmcli") {
-            "present"
-        } else {
-            "MISSING"
-        }
-    );
-    println!(
-        "  tailscale   {}",
-        if command_exists("tailscale") {
-            "present"
-        } else {
-            "absent"
-        }
-    );
-    println!(
-        "  adapter     {}",
-        s.iface.clone().unwrap_or_else(|| "none".into())
-    );
-    println!(
-        "  ssid        {}",
-        s.ssid.clone().unwrap_or_else(|| "—".into())
-    );
-    println!(
-        "  ip          {}",
-        s.ip.clone().unwrap_or_else(|| "—".into())
-    );
-    println!("  internet    {}", if s.internet { "ok" } else { "DOWN" });
-    if let Some(h) = &s.tailscale {
-        println!("  tailscale   {} (exit {})", h.describe(), s.exit_node);
-    }
-
-    if let Some(iface) = &s.iface {
-        let visible = nm::visible_ssids(iface);
-        let known: Vec<&str> = cfg
-            .networks
-            .iter()
-            .filter(|n| visible.contains(&n.ssid))
-            .map(|n| n.ssid.as_str())
-            .collect();
-        println!(
-            "  in range    {}",
-            if known.is_empty() {
-                "none of your saved networks".into()
-            } else {
-                known.join(", ")
-            }
-        );
-    }
-    println!("\nFull report: {C_DIM}breadcrumbs doctor --full{C_RESET}");
-    Ok(0)
-}
-
-fn cmd_cd(shell: bool) -> Result<i32, String> {
-    let dir = config::config_dir();
-    if shell {
-        let sh = std::env::var("SHELL").unwrap_or_else(|_| "/bin/sh".into());
-        let err = exec_replace(&sh, &["-lc", &format!("cd {:?} && exec {sh}", dir)]);
-        return Err(err);
-    }
-    println!("{}", dir.display());
-    Ok(0)
-}
-
-fn exec_replace(prog: &str, args: &[&str]) -> String {
-    use std::os::unix::process::CommandExt;
-    let e = Command::new(prog).args(args).exec();
-    format!("exec {prog} failed: {e}")
-}
-
-fn cmd_install_service(enable: bool) -> Result<i32, String> {
-    let unit_dir = home_dir().join(".config/systemd/user");
-    std::fs::create_dir_all(&unit_dir)
-        .map_err(|e| format!("creating {}: {e}", unit_dir.display()))?;
-    let bin = std::env::current_exe().map_err(|e| format!("resolving current executable: {e}"))?;
-    // Ordering against graphical-session.target lets the watcher inherit the
-    // session's DISPLAY/WAYLAND_DISPLAY/DBUS so notify-send and the Tailscale
-    // login browser-open actually work. PATH is pinned because systemd --user
-    // units do not get the login shell's PATH, and the watcher shells out to
-    // nmcli/tailscale/sudo/xdg-open by name.
-    let unit = format!(
-        "[Unit]\n\
-         Description=breadcrumbs Wi-Fi state machine watcher\n\
-         After=network.target NetworkManager.service graphical-session.target\n\
-         Wants=network.target graphical-session.target\n\n\
-         [Service]\n\
-         Type=simple\n\
-         Environment=PATH=/usr/local/bin:/usr/bin:/bin\n\
-         ExecStart={bin} watch\n\
-         Restart=always\n\
-         RestartSec=5\n\
-         Nice=5\n\n\
-         [Install]\n\
-         WantedBy=default.target\n",
-        bin = bin.display()
-    );
-    let unit_path = unit_dir.join("breadcrumbs.service");
-    std::fs::write(&unit_path, unit)
-        .map_err(|e| format!("writing {}: {e}", unit_path.display()))?;
-    println!("{C_GREEN}wrote{C_RESET} {}", unit_path.display());
-
-    let _ = run(
-        "systemctl",
-        &["--user", "daemon-reload"],
-        Duration::from_secs(10),
-    );
-    if enable {
-        let o = run(
-            "systemctl",
-            &["--user", "enable", "--now", "breadcrumbs.service"],
-            Duration::from_secs(15),
-        );
-        if o.success {
-            println!("{C_GREEN}enabled + started{C_RESET} breadcrumbs.service");
-        } else {
-            println!(
-                "{C_YELLOW}unit installed{C_RESET}; enable failed: {}",
-                o.stderr.trim()
-            );
-            return Ok(1);
-        }
-    } else {
-        println!("Run: systemctl --user enable --now breadcrumbs.service");
-    }
-    Ok(0)
+    std::process::exit(breadcrumbs::app::run());
 }

src/nm.rs

@@ -2,7 +2,7 @@ use std::collections::HashSet;
 use std::time::Duration;
 
 use crate::config::NetworkDef;
-use crate::util::{run, run_ok};
+use crate::util::{run, run_ok, run_with_stdin};
 
 /// nmcli `-t` escapes `:` and `\` in field values; undo that.
 fn unescape(s: &str) -> String {
@@ -22,8 +22,11 @@ fn unescape(s: &str) -> String {
 }
 
 /// Split one nmcli `-t` line into fields. Fields are ':'-separated but values
-/// escape ':' as '\:' and '\' as '\\'.
-fn parse_scan_line(line: &str) -> Vec<String> {
+/// escape ':' as '\:' and '\' as '\\' — a plain `splitn(2, ':')` mis-splits
+/// any field (device name, connection name, SSID, …) that legitimately
+/// contains a colon, so every terse-output parse in this module goes through
+/// here rather than splitting on raw bytes. Fields are returned unescaped.
+fn split_fields(line: &str) -> Vec<String> {
     let mut fields: Vec<String> = Vec::new();
     let mut cur = String::new();
     let mut chars = line.chars().peekable();
@@ -55,9 +58,9 @@ pub fn wifi_interface() -> Option<String> {
         return None;
     }
     for line in o.stdout.lines() {
-        let parts: Vec<&str> = line.splitn(2, ':').collect();
-        if parts.len() == 2 && parts[1] == "wifi" {
-            return Some(unescape(parts[0]));
+        let fields = split_fields(line);
+        if fields.len() >= 2 && fields[1] == "wifi" {
+            return Some(fields[0].clone());
         }
     }
     None
@@ -132,7 +135,7 @@ pub fn scan_list(iface: &str) -> Vec<ScanEntry> {
         return out;
     }
     for line in o.stdout.lines() {
-        let fields = parse_scan_line(line);
+        let fields = split_fields(line);
         if fields.is_empty() {
             continue;
         }
@@ -168,9 +171,9 @@ pub fn active_ssid(iface: &str) -> Option<String> {
         return None;
     }
     for line in o.stdout.lines() {
-        let parts: Vec<&str> = line.splitn(2, ':').collect();
-        if parts.len() == 2 && parts[0] == "yes" {
-            let s = unescape(parts[1].trim());
+        let fields = split_fields(line);
+        if fields.len() >= 2 && fields[0] == "yes" {
+            let s = fields[1].trim().to_string();
             if !s.is_empty() {
                 return Some(s);
             }
@@ -189,9 +192,9 @@ pub fn device_connected(iface: &str) -> bool {
         return false;
     }
     for line in o.stdout.lines() {
-        let parts: Vec<&str> = line.splitn(2, ':').collect();
-        if parts.len() == 2 && unescape(parts[0]) == iface {
-            return parts[1].starts_with("connected");
+        let fields = split_fields(line);
+        if fields.len() >= 2 && fields[0] == iface {
+            return fields[1].starts_with("connected");
         }
     }
     false
@@ -254,11 +257,11 @@ fn first_profile_for_ssid(ssid: &str) -> Option<String> {
     }
     let mut fallback: Option<String> = None;
     for line in o.stdout.lines() {
-        let parts: Vec<&str> = line.splitn(2, ':').collect();
-        if parts.len() < 2 || !parts[1].contains("wireless") {
+        let fields = split_fields(line);
+        if fields.len() < 2 || !fields[1].contains("wireless") {
             continue;
         }
-        let name = unescape(parts[0]);
+        let name = fields[0].clone();
         if name == ssid {
             return Some(name);
         }
@@ -281,29 +284,27 @@ pub fn connect(iface: &str, net: &NetworkDef, wait: u32, dns: &str) -> bool {
 
 /// Connect to a network and pin DNS. Returns the nmcli error on failure.
 ///
-/// Reuses an existing saved profile for the SSID when one exists (updating its
-/// PSK) so that repeated connections do not accumulate numbered duplicates in
+/// Reuses an existing saved profile for the SSID when one exists so that
+/// repeated connections do not accumulate numbered duplicates in
 /// NetworkManager ("NCC", "NCC 1", "NCC 2", …). Falls back to
 /// `nmcli device wifi connect` — which creates a new profile — only when no
 /// saved profile is found.
+///
+/// `net.password` is only sent when `Some`: on the reuse path, `None` means
+/// "leave the saved PSK alone" (either NetworkManager already durably owns
+/// it, or the network is open); on the create path it means "no password
+/// at all", which is also how a genuinely open (no-security) SSID is
+/// connected. See the field doc on [`NetworkDef::password`] for how a local
+/// secret transitions to `None` after its first successful use.
+///
+/// When a password *is* sent it goes to `nmcli --ask` on stdin, never on
+/// argv — `/proc/<pid>/cmdline` is world-readable. After the first success
+/// breadcrumbs clears its local copy, so subsequent connects pass nothing.
 pub fn connect_verbose(iface: &str, net: &NetworkDef, wait: u32, dns: &str) -> Result<(), String> {
     let wait_s = wait.to_string();
+    let timeout = Duration::from_secs(wait as u64 + 15);
 
     if let Some(profile) = first_profile_for_ssid(&net.ssid) {
-        // Update the saved PSK and, for hidden networks, ensure the flag is set.
-        if !net.password.is_empty() {
-            let _ = run(
-                "nmcli",
-                &[
-                    "connection",
-                    "modify",
-                    &profile,
-                    "802-11-wireless-security.psk",
-                    net.password.as_str(),
-                ],
-                Duration::from_secs(6),
-            );
-        }
         if net.hidden {
             let _ = run(
                 "nmcli",
@@ -317,11 +318,52 @@ pub fn connect_verbose(iface: &str, net: &NetworkDef, wait: u32, dns: &str) -> R
                 Duration::from_secs(6),
             );
         }
-        let o = run(
-            "nmcli",
-            &["--wait", &wait_s, "connection", "up", &profile, "ifname", iface],
-            Duration::from_secs(wait as u64 + 15),
-        );
+        let o = if let Some(pw) = &net.password {
+            // WHY: a stored PSK makes NM skip the secret agent, so --ask
+            // would never read stdin. Resetting the property (empty value,
+            // not a secret) forces a request; the new PSK arrives on stdin.
+            let _ = run(
+                "nmcli",
+                &[
+                    "connection",
+                    "modify",
+                    &profile,
+                    "802-11-wireless-security.psk",
+                    "",
+                ],
+                Duration::from_secs(6),
+            );
+            let stdin = format!("{pw}\n");
+            run_with_stdin(
+                "nmcli",
+                &[
+                    "--ask",
+                    "--wait",
+                    &wait_s,
+                    "connection",
+                    "up",
+                    &profile,
+                    "ifname",
+                    iface,
+                ],
+                Some(&stdin),
+                timeout,
+            )
+        } else {
+            run(
+                "nmcli",
+                &[
+                    "--wait",
+                    &wait_s,
+                    "connection",
+                    "up",
+                    &profile,
+                    "ifname",
+                    iface,
+                ],
+                timeout,
+            )
+        };
         if !o.success {
             let detail = o.stderr.trim().to_string();
             return Err(if detail.is_empty() {
@@ -338,21 +380,51 @@ pub fn connect_verbose(iface: &str, net: &NetworkDef, wait: u32, dns: &str) -> R
 
     // No saved profile — create one via device wifi connect.
     let hidden = if net.hidden { "yes" } else { "no" };
-    let args = [
-        "--wait",
-        &wait_s,
-        "device",
-        "wifi",
-        "connect",
-        net.ssid.as_str(),
-        "password",
-        net.password.as_str(),
-        "hidden",
-        hidden,
-        "ifname",
-        iface,
-    ];
-    let o = run("nmcli", &args, Duration::from_secs(wait as u64 + 15));
+    let o = if let Some(pw) = &net.password {
+        // WHY: never put the PSK on argv — /proc/<pid>/cmdline is
+        // world-readable. `nmcli --ask` registers as a secret agent and
+        // nmc_readline reads the PSK from stdin (one line). Open networks
+        // stay on the no-ask path so we don't hang on a prompt.
+        let stdin = format!("{pw}\n");
+        run_with_stdin(
+            "nmcli",
+            &[
+                "--ask",
+                "--wait",
+                &wait_s,
+                "device",
+                "wifi",
+                "connect",
+                net.ssid.as_str(),
+                "hidden",
+                hidden,
+                "ifname",
+                iface,
+            ],
+            Some(&stdin),
+            timeout,
+        )
+    } else {
+        // No local PSK: either the SSID is open, or NM should already hold
+        // the secret — the latter only succeeds if a saved profile exists,
+        // which is why we only reach this branch when that assumption held.
+        run(
+            "nmcli",
+            &[
+                "--wait",
+                &wait_s,
+                "device",
+                "wifi",
+                "connect",
+                net.ssid.as_str(),
+                "hidden",
+                hidden,
+                "ifname",
+                iface,
+            ],
+            timeout,
+        )
+    };
     if !o.success {
         let detail = o.stderr.trim().to_string();
         return Err(if detail.is_empty() {
@@ -380,12 +452,12 @@ pub fn delete_connections_for_ssid(ssid: &str) -> bool {
     }
     let mut removed = false;
     for line in list.stdout.lines() {
-        let parts: Vec<&str> = line.splitn(2, ':').collect();
-        if parts.len() < 2 {
+        let fields = split_fields(line);
+        if fields.len() < 2 {
             continue;
         }
-        let name = unescape(parts[0]);
-        let typ = parts[1];
+        let name = fields[0].clone();
+        let typ = &fields[1];
         if !typ.contains("wireless") {
             continue;
         }
@@ -421,17 +493,37 @@ mod tests {
     }
 
     #[test]
-    fn parse_scan_line_splits_and_unescapes() {
+    fn split_fields_splits_and_unescapes() {
         // SSID:SIGNAL:SECURITY with an escaped ':' inside the SSID.
-        let f = parse_scan_line(r"My\:Net:72:WPA2");
+        let f = split_fields(r"My\:Net:72:WPA2");
         assert_eq!(f, vec!["My:Net", "72", "WPA2"]);
 
         // SSID with a space (common in real network names)
-        let f = parse_scan_line("My Network:88:WPA2");
+        let f = split_fields("My Network:88:WPA2");
         assert_eq!(f, vec!["My Network", "88", "WPA2"]);
 
         // Empty SSID (hidden) keeps the empty leading field.
-        let f = parse_scan_line(":40:WPA3");
+        let f = split_fields(":40:WPA3");
         assert_eq!(f, vec!["", "40", "WPA3"]);
     }
+
+    #[test]
+    fn split_fields_two_column_with_colon_in_first_field() {
+        // A connection NAME or SSID containing a literal ':' must not be
+        // mis-split into TYPE — this is what a plain `splitn(2, ':')` gets
+        // wrong (e.g. `wifi_interface`/`first_profile_for_ssid` parsing).
+        let f = split_fields(r"Office\:5G:802-11-wireless");
+        assert_eq!(f, vec!["Office:5G", "802-11-wireless"]);
+    }
+
+    #[test]
+    fn split_fields_empty_line() {
+        assert_eq!(split_fields(""), vec![""]);
+    }
+
+    #[test]
+    fn split_fields_trailing_backslash_in_field() {
+        let f = split_fields(r"trail\\:wifi");
+        assert_eq!(f, vec![r"trail\", "wifi"]);
+    }
 }

src/state.rs

@@ -2,7 +2,7 @@ use std::fs;
 
 use serde::{Deserialize, Serialize};
 
-use crate::config::{state_dir, state_path};
+use crate::config::{state_dir, state_path, Config};
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct State {
@@ -32,3 +32,22 @@ impl State {
         fs::write(state_path(), text).map_err(|e| format!("writing state: {e}"))
     }
 }
+
+/// Persist `name` as the active profile if it exists in `cfg`. Shared by the
+/// CLI `profile set` path and `bread.command.crumbs.set_profile` so they
+/// cannot drift. Does not run [`crate::flow::run`] — the CLI applies
+/// afterwards unless `--no-apply`, and the watch daemon picks the new
+/// profile up on its next tick.
+pub fn set_profile(cfg: &Config, name: &str) -> Result<(), String> {
+    if !cfg.profiles.contains_key(name) {
+        let avail: Vec<&String> = cfg.profiles.keys().collect();
+        return Err(format!("unknown profile '{name}'. Available: {avail:?}"));
+    }
+    State {
+        profile: name.to_string(),
+        updated: crate::util::timestamp(),
+    }
+    .save()?;
+    crate::notify::log(&format!("profile set -> {name}"));
+    Ok(())
+}

src/tailscale.rs

@@ -381,4 +381,77 @@ mod tests {
         });
         assert_eq!(exit_node_state(&v, "exitnode"), (true, true, false));
     }
+
+    #[test]
+    fn exit_node_lookup_is_case_insensitive() {
+        let v = json!({
+            "Peer": {
+                "k1": { "HostName": "ExitNode", "DNSName": "ExitNode.ts.net.",
+                        "Online": true, "ExitNode": true, "ExitNodeOption": true }
+            }
+        });
+        assert_eq!(exit_node_state(&v, "EXITNODE"), (true, true, true));
+    }
+
+    #[test]
+    fn exit_node_state_with_no_peers_is_all_false() {
+        let v = json!({ "BackendState": "Running" });
+        assert_eq!(exit_node_state(&v, "exitnode"), (false, false, false));
+    }
+
+    #[test]
+    fn exit_node_state_empty_node_name_matches_nothing() {
+        let v = json!({
+            "Peer": {
+                "k1": { "HostName": "exitnode", "DNSName": "exitnode.ts.net.",
+                        "Online": true, "ExitNode": true, "ExitNodeOption": true }
+            }
+        });
+        assert_eq!(exit_node_state(&v, ""), (false, false, false));
+    }
+
+    #[test]
+    fn exit_node_status_online_only_applies_when_selected() {
+        // ExitNodeStatus.Online reflects the currently *active* exit node —
+        // it must not leak into the reported state of a peer that merely
+        // matches by name but isn't the one actually selected.
+        let v = json!({
+            "ExitNodeStatus": { "Online": true },
+            "Peer": {
+                "k1": { "HostName": "other", "DNSName": "other.ts.net.",
+                        "Online": false, "ExitNode": false, "ExitNodeOption": true }
+            }
+        });
+        assert_eq!(exit_node_state(&v, "other"), (true, false, false));
+    }
+
+    #[test]
+    fn ts_health_is_ok_only_for_ok_variant() {
+        assert!(TsHealth::Ok.is_ok());
+        assert!(!TsHealth::NotInstalled.is_ok());
+        assert!(!TsHealth::NeedsLogin.is_ok());
+        assert!(!TsHealth::Stopped.is_ok());
+        assert!(!TsHealth::ExitNodeMissing.is_ok());
+        assert!(!TsHealth::ExitNodeOffline.is_ok());
+        assert!(!TsHealth::Error("x".into()).is_ok());
+    }
+
+    #[test]
+    fn ts_health_describe_is_human_readable() {
+        assert_eq!(TsHealth::Ok.describe(), "ok");
+        assert_eq!(
+            TsHealth::NeedsLogin.describe(),
+            "not logged in (run: tailscale up)"
+        );
+        assert_eq!(TsHealth::Error("boom".into()).describe(), "error: boom");
+    }
+
+    #[test]
+    fn extract_url_finds_https_token_among_others() {
+        assert_eq!(
+            extract_url("To authenticate, visit: https://login.tailscale.com/abc"),
+            Some("https://login.tailscale.com/abc".to_string())
+        );
+        assert_eq!(extract_url("no url on this line"), None);
+    }
 }

src/util.rs

@@ -1,3 +1,4 @@
+use std::cell::RefCell;
 use std::io::{Read, Write};
 use std::path::PathBuf;
 use std::process::{Command, Stdio};
@@ -10,17 +11,6 @@ pub fn home_dir() -> PathBuf {
         .unwrap_or_else(|| PathBuf::from("/root"))
 }
 
-pub fn command_exists(name: &str) -> bool {
-    if let Some(paths) = std::env::var_os("PATH") {
-        for dir in std::env::split_paths(&paths) {
-            if dir.join(name).is_file() {
-                return true;
-            }
-        }
-    }
-    false
-}
-
 #[derive(Debug, Clone)]
 pub struct Output {
     pub success: bool,
@@ -38,6 +28,65 @@ impl Output {
     }
 }
 
+/// Everything breadcrumbs does to touch the outside world *other than* its
+/// own file I/O and env var reads: spawning an external program, and
+/// checking whether one is available at all. Every call site in this crate
+/// (`nm.rs`, `tailscale.rs`, `status.rs`, `notify.rs`, `app.rs`) goes through
+/// the free functions below (`run`/`run_with_stdin`/`run_ok`/
+/// `command_exists`), which are thin wrappers dispatching to whatever
+/// `Runner` is currently installed in the thread-local slot — `RealRunner` by
+/// default.
+///
+/// Tests swap in a fake implementation via [`with_runner`] so real call
+/// chains (`flow::run`, `watch::classify`, …) can be driven in-process
+/// against canned output, with no subprocess ever spawned and full
+/// visibility into exactly what *would* have been executed — the natural
+/// mechanism for asserting things like "no password ever reaches nmcli's
+/// argv on a repeat connect" (see the credential tests under `tests/`).
+///
+/// A thread-local (rather than an explicit parameter threaded through every
+/// function) was chosen so the large existing call surface in `nm.rs` et al.
+/// didn't need every signature rewritten to carry a `&dyn Runner` — call
+/// sites are unchanged, only `util`'s internals dispatch differently. It's
+/// safe across `cargo test`'s parallel test threads because each thread gets
+/// its own independent slot, defaulting to `RealRunner`, so tests that don't
+/// install a fake are unaffected by ones that do.
+pub trait Runner {
+    fn run(&self, prog: &str, args: &[&str], stdin: Option<&str>, timeout: Duration) -> Output;
+    fn command_exists(&self, name: &str) -> bool;
+}
+
+struct RealRunner;
+
+impl Runner for RealRunner {
+    fn run(&self, prog: &str, args: &[&str], stdin: Option<&str>, timeout: Duration) -> Output {
+        spawn_run(prog, args, stdin, timeout)
+    }
+
+    fn command_exists(&self, name: &str) -> bool {
+        path_lookup_exists(name)
+    }
+}
+
+fn path_lookup_exists(name: &str) -> bool {
+    if let Some(paths) = std::env::var_os("PATH") {
+        for dir in std::env::split_paths(&paths) {
+            if dir.join(name).is_file() {
+                return true;
+            }
+        }
+    }
+    false
+}
+
+thread_local! {
+    static RUNNER: RefCell<Box<dyn Runner>> = RefCell::new(Box::new(RealRunner));
+}
+
+pub fn command_exists(name: &str) -> bool {
+    RUNNER.with(|r| r.borrow().command_exists(name))
+}
+
 /// Run a command with a hard timeout. The child is killed if it overruns so a
 /// hung nmcli/tailscale can never wedge the daemon.
 pub fn run(prog: &str, args: &[&str], timeout: Duration) -> Output {
@@ -48,6 +97,32 @@ pub fn run(prog: &str, args: &[&str], timeout: Duration) -> Output {
 /// secrets (e.g. Wi-Fi PSKs) to `nmcli --ask` without exposing them in argv,
 /// where any local user could read them via `ps`.
 pub fn run_with_stdin(prog: &str, args: &[&str], stdin: Option<&str>, timeout: Duration) -> Output {
+    RUNNER.with(|r| r.borrow().run(prog, args, stdin, timeout))
+}
+
+pub fn run_ok(prog: &str, args: &[&str], timeout: Duration) -> bool {
+    run(prog, args, timeout).success
+}
+
+/// Swap the thread-local [`Runner`] for `runner` for the duration of `f`,
+/// restoring whatever was previously installed afterward — even if `f`
+/// panics, so a failing assertion inside a test can't leak a fake runner
+/// into whatever test happens to run next on this thread. This is the seam
+/// integration tests use to drive real logic without spawning subprocesses.
+pub fn with_runner<R, T>(runner: R, f: impl FnOnce() -> T) -> T
+where
+    R: Runner + 'static,
+{
+    let prev = RUNNER.with(|r| std::mem::replace(&mut *r.borrow_mut(), Box::new(runner)));
+    let result = std::panic::catch_unwind(std::panic::AssertUnwindSafe(f));
+    RUNNER.with(|r| *r.borrow_mut() = prev);
+    match result {
+        Ok(v) => v,
+        Err(payload) => std::panic::resume_unwind(payload),
+    }
+}
+
+fn spawn_run(prog: &str, args: &[&str], stdin: Option<&str>, timeout: Duration) -> Output {
     let stdin_cfg = if stdin.is_some() {
         Stdio::piped()
     } else {
@@ -115,10 +190,6 @@ pub fn run_with_stdin(prog: &str, args: &[&str], stdin: Option<&str>, timeout: D
     }
 }
 
-pub fn run_ok(prog: &str, args: &[&str], timeout: Duration) -> bool {
-    run(prog, args, timeout).success
-}
-
 /// Local "YYYY-MM-DD HH:MM:SS". Uses `date` for correct local time, falling
 /// back to a dependency-free UTC computation if it is unavailable.
 pub fn timestamp() -> String {
@@ -176,4 +247,41 @@ mod tests {
         // Leap day 2024-02-29 12:00:00 UTC
         assert_eq!(fmt_epoch(1_709_208_000), "2024-02-29 12:00:00");
     }
+
+    #[test]
+    fn fmt_epoch_pre_1970_is_handled() {
+        // The div_euclid/rem_euclid split must stay correct for negative
+        // epoch seconds (dates before 1970), not just the common positive case.
+        assert_eq!(fmt_epoch(-86_400), "1969-12-31 00:00:00");
+    }
+
+    #[test]
+    fn fmt_epoch_year_and_month_boundaries() {
+        assert_eq!(fmt_epoch(1_704_067_199), "2023-12-31 23:59:59");
+        assert_eq!(fmt_epoch(1_735_689_600), "2025-01-01 00:00:00");
+        // Last second of October (non-leap-day month boundary).
+        assert_eq!(fmt_epoch(1_730_419_199), "2024-10-31 23:59:59");
+    }
+
+    #[test]
+    fn command_exists_false_for_bogus_binary() {
+        assert!(!command_exists("definitely-not-a-real-binary-xyz123"));
+    }
+
+    #[test]
+    fn command_exists_true_for_a_real_binary() {
+        // `sh` is guaranteed present on any POSIX system this runs on.
+        assert!(command_exists("sh"));
+    }
+
+    #[test]
+    fn run_on_missing_binary_fails_cleanly_instead_of_panicking() {
+        let o = run(
+            "definitely-not-a-real-binary-xyz123",
+            &[],
+            Duration::from_secs(1),
+        );
+        assert!(!o.success);
+        assert_eq!(o.stdout, "");
+    }
 }

src/watch.rs

@@ -4,6 +4,9 @@ use std::sync::mpsc::{self, Receiver};
 use std::thread;
 use std::time::{Duration, Instant};
 
+use bread_utils::bread_client::BreadClient;
+
+use crate::bread_events;
 use crate::config::Config;
 use crate::flow;
 use crate::notify::{log, notify, Urgency};
@@ -11,16 +14,45 @@ use crate::state::State;
 use crate::status::{self};
 use crate::tailscale::TsHealth;
 
+/// Coarse health classification the watch loop reacts to each tick. `pub`
+/// (and so is [`classify`]) purely so integration tests can drive the real
+/// classification logic in-process against a faked [`crate::util::Runner`],
+/// instead of only being able to observe it indirectly through the watch
+/// loop's side effects.
 #[derive(PartialEq, Eq, Clone, Debug)]
-enum Health {
+pub enum Health {
     Up,
     DownNoNet,
     DownTailscaleManual,
     DownTailscaleOther,
     NoAdapter,
+    /// `profile` isn't defined in the config (e.g. state still points at a
+    /// custom profile the user deleted from breadcrumbs.toml).
+    UnknownProfile,
 }
 
-fn classify(cfg: &Config, profile: &str) -> (Health, Option<String>) {
+impl Health {
+    /// Wire name used in `bread.crumbs.health.changed` — the Rust variant
+    /// as a string, not a prettier label.
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Health::Up => "Up",
+            Health::DownNoNet => "DownNoNet",
+            Health::DownTailscaleManual => "DownTailscaleManual",
+            Health::DownTailscaleOther => "DownTailscaleOther",
+            Health::NoAdapter => "NoAdapter",
+            Health::UnknownProfile => "UnknownProfile",
+        }
+    }
+}
+
+pub fn classify(cfg: &Config, profile: &str) -> (Health, Option<String>) {
+    // Checked before gather(): a profile missing from config would otherwise
+    // silently fall back to "tailscale not required" and read as healthy off
+    // of nothing but a bare internet check, never surfacing the misconfig.
+    if cfg.profile(profile).is_none() {
+        return (Health::UnknownProfile, None);
+    }
     let s = status::gather(cfg, profile);
     if s.iface.is_none() {
         return (Health::NoAdapter, None);
@@ -43,6 +75,15 @@ fn classify(cfg: &Config, profile: &str) -> (Health, Option<String>) {
     }
 }
 
+/// Whether a debounced signal is allowed to fire. `None` (never fired) always
+/// fires; otherwise it fires only once more than `gap` has elapsed since the
+/// last fire. Pulled out as a pure helper so the debounce logic is testable and
+/// so the "first event fires immediately" case is expressed without the
+/// panic-prone `Instant::now() - gap` seed.
+fn debounce_ready(last: Option<Instant>, gap: Duration) -> bool {
+    last.map(|t| t.elapsed() > gap).unwrap_or(true)
+}
+
 /// Tail `nmcli monitor` and ping the channel on link-state churn so we react
 /// to drops within a second instead of waiting out the poll interval.
 fn spawn_nm_monitor(tx: mpsc::Sender<()>) {
@@ -62,14 +103,20 @@ fn spawn_nm_monitor(tx: mpsc::Sender<()>) {
         };
         if let Some(out) = child.stdout.take() {
             let reader = BufReader::new(out);
-            let mut last = Instant::now() - Duration::from_secs(10);
+            // `None` means "haven't fired yet, so fire on the first interesting
+            // line". Storing an `Option` instead of seeding with
+            // `Instant::now() - 10s` avoids a panic: `Instant - Duration`
+            // underflows (and panics) when the monotonic clock is younger than
+            // the offset, which happens if `watch` starts within ~10s of boot —
+            // exactly when the systemd unit (ordered after graphical-session)
+            // tends to launch.
+            let mut last: Option<Instant> = None;
             for line in reader.lines().map_while(Result::ok) {
                 let l = line.to_lowercase();
-                let interesting = l.contains("disconnect")
-                    || l.contains("unavailable")
-                    || l.contains("failed");
-                if interesting && last.elapsed() > Duration::from_millis(1500) {
-                    last = Instant::now();
+                let interesting =
+                    l.contains("disconnect") || l.contains("unavailable") || l.contains("failed");
+                if interesting && debounce_ready(last, Duration::from_millis(1500)) {
+                    last = Some(Instant::now());
                     let _ = tx.send(());
                 }
             }
@@ -104,7 +151,22 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
     log("watch: started");
 
     let (tx, rx) = mpsc::channel::<()>();
-    spawn_nm_monitor(tx);
+    spawn_nm_monitor(tx.clone());
+
+    // Long-lived, so this uses BreadClient::subscribe (a persistent
+    // background thread with its own reconnect/backoff loop). breadd being
+    // absent or restarting is transparent: the subscription just quietly
+    // stops delivering commands until it reconnects. A successful
+    // `set_profile` wakes this loop the same way `nmcli monitor` does, so
+    // the new profile is applied on the next tick instead of waiting out
+    // the current poll interval.
+    let bread = BreadClient::connect(bread_events::APP_ID);
+    let wake = tx;
+    let _commands = bread.subscribe("bread.command.crumbs.**", move |event| {
+        if bread_events::handle_command(&event) {
+            let _ = wake.send(());
+        }
+    });
 
     let mut profile = State::load(&cfg.settings.default_profile).profile;
     if run_initial {
@@ -116,7 +178,7 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
             ));
         } else {
             log(&format!("watch: initial flow for profile={profile}"));
-            let _ = flow::run(&cfg, &profile);
+            let _ = flow::run(&mut cfg, &profile);
         }
     }
 
@@ -128,6 +190,12 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
 
     loop {
         // Reload config + state so edits and `profile set` take effect live.
+        // This always runs *before* `flow::run` below (never after, within
+        // the same tick), so a password `flow::run` clears-and-saves this
+        // iteration is durably on disk by the time the *next* iteration's
+        // reload runs — there's no window where a stale (still-has-password)
+        // reload could clobber the save, since the two never race on
+        // different threads: everything here is sequential on this loop.
         if let Ok(fresh) = Config::load() {
             cfg = fresh;
         }
@@ -143,6 +211,7 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
                 &format!("{prev_profile} -> {profile}"),
                 Urgency::Low,
             );
+            bread_events::emit_profile_changed(&bread, &prev_profile, &profile);
             prev_profile = profile.clone();
             prev_health = None; // force re-evaluation/recovery for new profile
             last_flow_at = None; // allow immediate recovery on profile change
@@ -150,6 +219,9 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
 
         let (health, ssid) = classify(&cfg, &profile);
         let transition = prev_health.as_ref() != Some(&health);
+        if transition {
+            bread_events::emit_health_changed(&bread, &profile, health.as_str(), ssid.as_deref());
+        }
 
         match &health {
             Health::Up => {
@@ -175,6 +247,15 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
                 }
                 fail_streak = fail_streak.saturating_add(1);
             }
+            Health::UnknownProfile => {
+                // flow::run() already notifies + logs the "unknown profile"
+                // critical error; re-running it here would just spam that on
+                // every tick, so only surface it once per transition.
+                if transition || profile_changed {
+                    let _ = flow::run(&mut cfg, &profile);
+                }
+                fail_streak = fail_streak.saturating_add(1);
+            }
             Health::DownTailscaleManual => {
                 // Can't be auto-fixed (login / not installed). Notify once.
                 if transition {
@@ -187,7 +268,7 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
                 }
                 // Re-run flow only on transition so we land on the bootstrap net.
                 if transition || profile_changed {
-                    let _ = flow::run(&cfg, &profile);
+                    let _ = flow::run(&mut cfg, &profile);
                 }
                 fail_streak = fail_streak.saturating_add(1);
             }
@@ -199,13 +280,15 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
                         Urgency::Normal,
                     );
                 }
-                let elapsed = last_flow_at.map(|t| t.elapsed().as_secs()).unwrap_or(u64::MAX);
+                let elapsed = last_flow_at
+                    .map(|t| t.elapsed().as_secs())
+                    .unwrap_or(u64::MAX);
                 if elapsed >= FLOW_COOLDOWN {
                     log(&format!(
                         "watch: down ({:?}) profile={profile} ssid={:?} — running flow",
                         health, ssid
                     ));
-                    let outcome = flow::run(&cfg, &profile);
+                    let outcome = flow::run(&mut cfg, &profile);
                     log(&format!("watch: recovery outcome = {:?}", outcome));
                     last_flow_at = Some(Instant::now());
                     fail_streak = if outcome.ok() {
@@ -230,3 +313,39 @@ pub fn run(mut cfg: Config, run_initial: bool) -> i32 {
         wait_for_tick(&rx, dur);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn debounce_fires_immediately_when_never_fired() {
+        // Regression guard for the old `Instant::now() - Duration::from_secs(10)`
+        // seed, which panicked near boot. `None` must fire without any
+        // subtraction on the clock.
+        assert!(debounce_ready(None, Duration::from_millis(1500)));
+    }
+
+    #[test]
+    fn debounce_suppresses_immediately_after_firing() {
+        let just_now = Instant::now();
+        assert!(!debounce_ready(Some(just_now), Duration::from_secs(3600)));
+    }
+
+    #[test]
+    fn debounce_fires_again_after_gap_elapses() {
+        // A zero gap is always already-elapsed, so a prior fire doesn't block.
+        let earlier = Instant::now();
+        assert!(debounce_ready(Some(earlier), Duration::from_millis(0)));
+    }
+
+    #[test]
+    fn health_as_str_is_the_variant_name() {
+        assert_eq!(Health::Up.as_str(), "Up");
+        assert_eq!(Health::DownNoNet.as_str(), "DownNoNet");
+        assert_eq!(Health::DownTailscaleManual.as_str(), "DownTailscaleManual");
+        assert_eq!(Health::DownTailscaleOther.as_str(), "DownTailscaleOther");
+        assert_eq!(Health::NoAdapter.as_str(), "NoAdapter");
+        assert_eq!(Health::UnknownProfile.as_str(), "UnknownProfile");
+    }
+}

tests/cli.rs

@@ -35,21 +35,48 @@ impl Sandbox {
 
     /// Binary invocation with an isolated, side-effect-free environment.
     fn cmd(&self, args: &[&str]) -> std::process::Output {
-        Command::new(BIN)
-            .args(args)
+        self.cmd_env(args, &[])
+    }
+
+    /// Like [`cmd`], with extra environment variables layered on top of the
+    /// isolated base (e.g. `EDITOR` for the `edit` command).
+    fn cmd_env(&self, args: &[&str], extra: &[(&str, &str)]) -> std::process::Output {
+        let mut c = Command::new(BIN);
+        c.args(args)
             .env_clear()
             .env("HOME", &self.root)
             .env("XDG_CONFIG_HOME", self.root.join("config"))
             .env("XDG_STATE_HOME", self.root.join("state"))
             // Empty bin dir => no external commands resolve.
-            .env("PATH", self.root.join("bin"))
-            .output()
-            .expect("failed to spawn breadcrumbs")
+            .env("PATH", self.root.join("bin"));
+        for (k, v) in extra {
+            c.env(k, v);
+        }
+        c.output().expect("failed to spawn breadcrumbs")
     }
 
     fn config_file(&self) -> PathBuf {
         self.root.join("config/breadcrumbs/breadcrumbs.toml")
     }
+
+    /// Saved networks live in their own file, split out of `breadcrumbs.toml`
+    /// (see `config::networks_path`).
+    fn networks_file(&self) -> PathBuf {
+        self.root.join("config/breadcrumbs/networks.toml")
+    }
+
+    /// Write an executable shell script into the sandbox's PATH dir so a
+    /// test can stand in for an external command (e.g. `$EDITOR`).
+    fn write_fake_bin(&self, name: &str, script: &str) -> PathBuf {
+        let path = self.root.join("bin").join(name);
+        fs::write(&path, script).unwrap();
+        #[cfg(unix)]
+        {
+            use std::os::unix::fs::PermissionsExt;
+            fs::set_permissions(&path, fs::Permissions::from_mode(0o755)).unwrap();
+        }
+        path
+    }
 }
 
 impl Drop for Sandbox {
@@ -62,6 +89,10 @@ fn stdout(o: &std::process::Output) -> String {
     String::from_utf8_lossy(&o.stdout).to_string()
 }
 
+fn stderr(o: &std::process::Output) -> String {
+    String::from_utf8_lossy(&o.stderr).to_string()
+}
+
 #[test]
 fn help_lists_all_commands() {
     let sb = Sandbox::new();
@@ -142,3 +173,415 @@ fn unknown_profile_override_is_reported() {
     let o = sb.cmd(&["--profile", "nope", "init"]);
     assert!(!o.status.success());
 }
+
+#[test]
+fn profile_set_unknown_reports_available_profiles() {
+    let sb = Sandbox::new();
+    sb.cmd(&["list"]); // bootstrap the config
+    let o = sb.cmd(&["profile", "set", "bogus"]);
+    assert!(!o.status.success());
+    let err = stderr(&o);
+    assert!(err.contains("unknown profile"), "stderr: {err}");
+    assert!(err.contains("home") && err.contains("work") && err.contains("away"));
+}
+
+#[test]
+fn profile_list_marks_exactly_the_current_profile() {
+    let sb = Sandbox::new();
+    sb.cmd(&["profile", "set", "home", "--no-apply"]);
+    let o = sb.cmd(&["profile", "list"]);
+    assert!(o.status.success());
+    let out = stdout(&o);
+    assert!(out.contains("* home"), "out: {out}");
+    assert_eq!(
+        out.lines()
+            .filter(|l| l.trim_start().starts_with('*'))
+            .count(),
+        1,
+        "expected exactly one marked profile, got: {out}"
+    );
+}
+
+#[test]
+fn add_with_multibyte_password_does_not_crash_list() {
+    // Regression test for a byte-slicing panic in the password-masking code:
+    // `list` used to index into the first *byte* of the password, which
+    // panicked whenever that byte fell mid-character in a multi-byte UTF-8
+    // password (e.g. non-Latin scripts or an emoji as the first character).
+    let sb = Sandbox::new();
+    let add = sb.cmd(&["add", "CafeWifi", "日本語パスワード🔒"]);
+    assert!(add.status.success(), "stderr: {}", stderr(&add));
+
+    let list = sb.cmd(&["list"]);
+    assert!(
+        list.status.success(),
+        "list crashed on multibyte password — stderr: {}",
+        stderr(&list)
+    );
+    assert!(!stdout(&list).contains("日本語パスワード🔒"));
+}
+
+#[test]
+fn list_hides_password_by_default_and_reveals_with_flag() {
+    let sb = Sandbox::new();
+    sb.cmd(&["add", "CafeWifi", "hunter2"]);
+
+    let hidden = sb.cmd(&["list"]);
+    assert!(!stdout(&hidden).contains("hunter2"));
+
+    let shown = sb.cmd(&["list", "--show-passwords"]);
+    assert!(stdout(&shown).contains("hunter2"));
+}
+
+#[test]
+fn add_to_profile_persists_in_config_priority_list() {
+    let sb = Sandbox::new();
+    sb.cmd(&["list"]); // bootstrap
+    let o = sb.cmd(&["add", "CafeWifi", "pw", "--to", "home"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+
+    let text = fs::read_to_string(sb.config_file()).unwrap();
+    let home_section = text.split("[profiles.home]").nth(1).unwrap_or("");
+    assert!(
+        home_section.contains("CafeWifi"),
+        "CafeWifi not attached under [profiles.home]: {text}"
+    );
+}
+
+#[test]
+fn forget_removes_network_from_config() {
+    let sb = Sandbox::new();
+    sb.cmd(&["add", "CafeWifi", "pw", "--to", "away"]);
+    let o = sb.cmd(&["forget", "CafeWifi"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+
+    // Networks live in networks.toml (see the split-secrets test below) —
+    // that's the file that actually needs to lose the entry.
+    let networks = fs::read_to_string(sb.networks_file()).unwrap();
+    assert!(
+        !networks.contains("CafeWifi"),
+        "network still in networks.toml: {networks}"
+    );
+    // ...and it should never have been in breadcrumbs.toml to begin with.
+    let text = fs::read_to_string(sb.config_file()).unwrap();
+    assert!(
+        !text.contains("CafeWifi"),
+        "network leaked into config: {text}"
+    );
+}
+
+#[test]
+fn detect_without_wifi_adapter_errors() {
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["detect"]);
+    assert!(!o.status.success());
+    assert!(
+        stderr(&o).contains("could not detect"),
+        "stderr: {}",
+        stderr(&o)
+    );
+}
+
+#[test]
+fn doctor_reports_missing_nmcli_in_sandbox() {
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["doctor"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+    assert!(stdout(&o).contains("MISSING"));
+}
+
+#[test]
+fn status_runs_without_crashing_when_offline() {
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["status"]);
+    // No adapter/internet in the sandbox, so this reports unhealthy (exit 1)
+    // rather than crashing.
+    assert_eq!(o.status.code(), Some(1));
+    let out = stdout(&o);
+    assert!(out.contains("breadcrumbs"));
+    assert!(out.contains("needs attention"));
+}
+
+#[test]
+fn cd_prints_the_config_directory() {
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["cd"]);
+    assert!(o.status.success());
+    let printed = PathBuf::from(stdout(&o).trim());
+    assert_eq!(printed, sb.root.join("config/breadcrumbs"));
+}
+
+#[test]
+fn install_service_no_enable_writes_valid_unit_file() {
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["install-service", "--no-enable"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+
+    let unit_path = sb.root.join(".config/systemd/user/breadcrumbs.service");
+    assert!(unit_path.exists());
+    let text = fs::read_to_string(unit_path).unwrap();
+    assert!(text.contains("ExecStart="));
+    assert!(text.contains("breadcrumbs watch"));
+    assert!(text.contains("[Install]"));
+    assert!(text.contains("WantedBy=default.target"));
+}
+
+#[test]
+fn edit_invokes_editor_then_validates_config() {
+    let sb = Sandbox::new();
+    sb.write_fake_bin("fake-editor", "#!/bin/sh\nexit 0\n");
+
+    let o = sb.cmd_env(&["edit"], &[("EDITOR", "fake-editor")]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+    assert!(stdout(&o).contains("config OK"));
+    assert!(sb.config_file().exists());
+}
+
+#[test]
+fn edit_reports_editor_failure() {
+    let sb = Sandbox::new();
+    sb.write_fake_bin("fake-editor", "#!/bin/sh\nexit 1\n");
+
+    let o = sb.cmd_env(&["edit"], &[("EDITOR", "fake-editor")]);
+    assert!(!o.status.success());
+    assert!(stderr(&o).contains("editor exited with error"));
+}
+
+// -----------------------------------------------------------------------
+// Split secrets file (item 5)
+// -----------------------------------------------------------------------
+
+#[test]
+fn networks_are_stored_separately_from_settings_and_profiles() {
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["add", "CafeWifi", "hunter2", "--to", "away"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+
+    let settings = fs::read_to_string(sb.config_file()).unwrap();
+    assert!(
+        !settings.contains("hunter2") && !settings.contains("[[networks]]"),
+        "breadcrumbs.toml should hold settings/profiles only, not network credentials: {settings}"
+    );
+    // The profile's priority list (an SSID *reference*, not a credential)
+    // does still live in breadcrumbs.toml — that's expected and fine.
+    assert!(settings.contains("[profiles.away]"));
+    assert!(settings.contains("CafeWifi"));
+
+    let networks = fs::read_to_string(sb.networks_file()).unwrap();
+    assert!(networks.contains("CafeWifi") && networks.contains("hunter2"));
+
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        let mode = fs::metadata(sb.networks_file())
+            .unwrap()
+            .permissions()
+            .mode()
+            & 0o777;
+        assert_eq!(mode, 0o600, "networks.toml should be owner-only");
+    }
+}
+
+#[test]
+fn add_with_empty_password_is_stored_as_no_password() {
+    // An explicitly empty password (e.g. `add SSID ""`, or a blank response
+    // at the interactive prompt) means "this is an open network" — it must
+    // round-trip as an absent `password` key, the same as a cleared one,
+    // not as `password = ""` (which `nm::connect_verbose` would treat as a
+    // blank secret rather than an open network).
+    let sb = Sandbox::new();
+    let o = sb.cmd(&["add", "OpenCafe", ""]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+
+    let networks = fs::read_to_string(sb.networks_file()).unwrap();
+    assert!(networks.contains("OpenCafe"));
+    assert!(!networks.contains("password"), "networks.toml: {networks}");
+
+    let list = sb.cmd(&["list"]);
+    assert!(stdout(&list).contains("managed by NetworkManager"));
+}
+
+// -----------------------------------------------------------------------
+// NM-owned credentials (item 4): a password is only ever needed once.
+// -----------------------------------------------------------------------
+
+/// A fake `nmcli` that behaves statefully enough to exercise the "first
+/// connect creates a profile with a password, second connect reuses it
+/// without one" path: it records every invocation's argv (one per line) to
+/// `$HOME/.nmcli-calls`, and remembers — via a marker file, also under
+/// `$HOME` — that "device wifi connect TestNet" has already run, so a
+/// following `connection show` reports a saved profile exists.
+const FAKE_NMCLI_STATEFUL: &str = r#"#!/bin/sh
+record="$HOME/.nmcli-calls"
+marker="$HOME/.nmcli-profile-created"
+echo "$@" >> "$record"
+args="$*"
+case "$args" in
+  "-t -f DEVICE,TYPE device status")
+    echo "wlan0:wifi" ;;
+  "radio wifi on") ;;
+  "device wifi rescan"*) ;;
+  "-t -f SSID device wifi list ifname wlan0")
+    echo "TestNet" ;;
+  "-t -f NAME,TYPE connection show")
+    if [ -f "$marker" ]; then
+      echo "TestNet:802-11-wireless"
+    fi
+    ;;
+  *"device wifi connect TestNet"*)
+    # `: > file` (truncate-or-create via a shell builtin + redirection) —
+    # not `touch`, which is an external binary and the sandbox's PATH
+    # deliberately contains nothing but this fake nmcli itself.
+    : > "$marker" ;;
+  *"connection up TestNet"*) ;;
+  *"802-11-wireless-security.psk"*) ;;
+  "-g GENERAL.CON-UUID device show wlan0")
+    echo "uuid-1" ;;
+  *"ipv4.ignore-auto-dns"*) ;;
+  "device reapply wlan0") ;;
+  "-t -f DEVICE,STATE device status")
+    echo "wlan0:connected" ;;
+  *) ;;
+esac
+exit 0
+"#;
+
+#[test]
+fn password_is_cleared_after_first_connect_and_never_sent_again() {
+    let sb = Sandbox::new();
+    sb.write_fake_bin("nmcli", FAKE_NMCLI_STATEFUL);
+
+    let add = sb.cmd(&["add", "TestNet", "hunter2"]);
+    assert!(add.status.success(), "stderr: {}", stderr(&add));
+    // "away" is the default profile and defaults to include_all_known, so
+    // TestNet is already a connect candidate with no `--to` needed.
+
+    let record = sb.root.join(".nmcli-calls");
+
+    // First connect: no saved NM profile yet, so breadcrumbs creates one via
+    // `nmcli --ask device wifi connect ...` with the PSK on stdin, not argv.
+    let first = sb.cmd(&["init"]);
+    assert!(first.status.success(), "stderr: {}", stderr(&first));
+    let first_calls = fs::read_to_string(&record).unwrap_or_default();
+    assert!(
+        first_calls.contains("device wifi connect TestNet") && first_calls.contains("--ask"),
+        "first connect should create a new NM profile via --ask: {first_calls}"
+    );
+    assert!(
+        !first_calls.contains("hunter2"),
+        "PSK must not appear on nmcli argv: {first_calls}"
+    );
+    // stdin payload is asserted in-process via FakeRunner (see flow_watch).
+
+    // The local copy is gone from disk immediately after.
+    let networks = fs::read_to_string(sb.networks_file()).unwrap();
+    assert!(
+        !networks.contains("hunter2"),
+        "password should have been cleared from networks.toml: {networks}"
+    );
+    assert!(
+        networks.contains("TestNet"),
+        "network entry itself should remain"
+    );
+
+    // Reset the recording so the second run's argv can be checked in isolation.
+    fs::write(&record, "").unwrap();
+
+    // Second connect: a saved profile now exists (per the fake nmcli's own
+    // bookkeeping) and breadcrumbs has no local password anymore, so it must
+    // reuse the profile via `connection up` and never send a PSK argument.
+    let second = sb.cmd(&["init"]);
+    assert!(second.status.success(), "stderr: {}", stderr(&second));
+    let second_calls = fs::read_to_string(&record).unwrap_or_default();
+    assert!(
+        second_calls.contains("connection up TestNet"),
+        "second connect should reuse the existing NM profile: {second_calls}"
+    );
+    assert!(
+        !second_calls.to_lowercase().contains("hunter2")
+            && !second_calls.contains("psk")
+            && !second_calls.contains("password"),
+        "second connect must never send a password argument: {second_calls}"
+    );
+}
+
+// -----------------------------------------------------------------------
+// CLI-level coverage through fake nmcli/tailscale (item 3)
+// -----------------------------------------------------------------------
+
+const FAKE_NMCLI_HEALTHY: &str = r#"#!/bin/sh
+args="$*"
+case "$args" in
+  "-t -f DEVICE,TYPE device status")
+    echo "wlan0:wifi" ;;
+  "-t -f ACTIVE,SSID device wifi list ifname wlan0")
+    echo "yes:HomeWifi" ;;
+  "-g IP4.ADDRESS device show wlan0")
+    echo "192.168.1.50/24" ;;
+  *) ;;
+esac
+exit 0
+"#;
+
+#[test]
+fn status_reports_healthy_through_fake_nmcli_and_curl() {
+    let sb = Sandbox::new();
+    sb.write_fake_bin("nmcli", FAKE_NMCLI_HEALTHY);
+    sb.write_fake_bin("curl", "#!/bin/sh\necho -n 204\nexit 0\n");
+
+    let o = sb.cmd(&["status"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+    let out = stdout(&o);
+    assert!(out.contains("HomeWifi"), "out: {out}");
+    assert!(out.contains("healthy"), "out: {out}");
+}
+
+#[test]
+fn doctor_reports_present_when_nmcli_and_tailscale_are_on_path() {
+    let sb = Sandbox::new();
+    sb.write_fake_bin("nmcli", FAKE_NMCLI_HEALTHY);
+    sb.write_fake_bin("tailscale", "#!/bin/sh\nexit 0\n");
+
+    let o = sb.cmd(&["doctor"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+    let out = stdout(&o);
+    assert!(
+        out.contains("nmcli") && out.contains("present"),
+        "out: {out}"
+    );
+    assert!(!out.contains("MISSING"), "out: {out}");
+}
+
+const FAKE_NMCLI_DETECT: &str = r#"#!/bin/sh
+args="$*"
+case "$args" in
+  "-t -f DEVICE,TYPE device status")
+    echo "wlan0:wifi" ;;
+  "radio wifi on") ;;
+  "device wifi rescan"*) ;;
+  "-t -f SSID device wifi list ifname wlan0")
+    echo "CorpWifi" ;;
+  *) ;;
+esac
+exit 0
+"#;
+
+#[test]
+fn detect_picks_profile_whose_detect_ssids_are_visible() {
+    let sb = Sandbox::new();
+    sb.write_fake_bin("nmcli", FAKE_NMCLI_DETECT);
+    sb.cmd(&["list"]); // bootstrap the default config (home/work/away)
+
+    // Attach a marker SSID to "work" so detection has something to match —
+    // the skeleton config ships with empty detect_ssids everywhere.
+    let text = fs::read_to_string(sb.config_file()).unwrap();
+    let patched = text.replace(
+        "[profiles.work]",
+        "[profiles.work]\ndetect_ssids = [\"CorpWifi\"]",
+    );
+    fs::write(sb.config_file(), patched).unwrap();
+
+    let o = sb.cmd(&["detect"]);
+    assert!(o.status.success(), "stderr: {}", stderr(&o));
+    assert_eq!(stdout(&o).trim(), "work");
+}

tests/common/mod.rs

@@ -0,0 +1,224 @@
+//! Shared test infrastructure for in-process integration tests (as opposed
+//! to `tests/cli.rs`'s black-box `Sandbox`, which spawns the compiled
+//! binary). This module is `mod`-included by each test file that needs it —
+//! see `tests/flow_watch.rs`.
+//!
+//! Two pieces:
+//!
+//! - [`FakeRunner`]: a `breadcrumbs::util::Runner` implementation driven by
+//!   rules ("if the program+args match this predicate, return this canned
+//!   `Output`"), which also records every invocation so a test can assert
+//!   exactly what was — or, just as importantly, was *not* — passed (e.g.
+//!   that a password argument never reaches a fake `nmcli`).
+//! - [`EnvSandbox`]: real logic (`flow::run`, `watch::classify`) still does
+//!   its own best-effort file logging via `notify::log`, which resolves a
+//!   path from `$HOME`/`$XDG_STATE_HOME`. `EnvSandbox` points those at a
+//!   throwaway tempdir for the duration of a test so nothing lands in the
+//!   developer's real `~/.local/state/breadcrumbs`. Mutating process env is
+//!   inherently cross-test-within-this-binary racy, so it's guarded by a
+//!   process-wide mutex — tests using it serialize against each other but
+//!   not against unrelated tests (each `tests/*.rs` file is its own binary).
+
+#![allow(dead_code)] // not every test file uses every helper here
+
+use std::cell::RefCell;
+use std::collections::HashSet;
+use std::path::{Path, PathBuf};
+use std::rc::Rc;
+use std::sync::atomic::{AtomicU32, Ordering};
+use std::sync::{Mutex, MutexGuard, OnceLock};
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+
+use breadcrumbs::util::{Output, Runner};
+
+/// One recorded call to the fake `Runner::run`.
+#[derive(Debug, Clone)]
+pub struct RecordedCall {
+    pub prog: String,
+    pub args: Vec<String>,
+    pub stdin: Option<String>,
+}
+
+impl RecordedCall {
+    /// Convenience for glob-style assertions, e.g.
+    /// `call.argv().contains(&"connection")`.
+    pub fn argv(&self) -> Vec<&str> {
+        std::iter::once(self.prog.as_str())
+            .chain(self.args.iter().map(String::as_str))
+            .collect()
+    }
+}
+
+type Matcher = Box<dyn Fn(&str, &[&str]) -> bool>;
+
+/// A canned, rule-based [`Runner`]. Rules are tried in registration order;
+/// the first whose matcher returns `true` supplies the response. No rule
+/// matching falls back to [`Output::failed`] — the same "closed" default the
+/// old empty-`PATH` sandbox relied on, so an un-anticipated call fails loud
+/// (a wrong exit code) rather than silently returning success.
+pub struct FakeRunner {
+    rules: Vec<(Matcher, Output)>,
+    commands: HashSet<String>,
+    calls: Rc<RefCell<Vec<RecordedCall>>>,
+}
+
+impl FakeRunner {
+    pub fn new() -> Self {
+        FakeRunner {
+            rules: Vec::new(),
+            commands: HashSet::new(),
+            calls: Rc::new(RefCell::new(Vec::new())),
+        }
+    }
+
+    /// Handle to inspect recorded calls after the runner has been consumed by
+    /// [`breadcrumbs::util::with_runner`] (which takes it by value).
+    pub fn calls_handle(&self) -> Rc<RefCell<Vec<RecordedCall>>> {
+        self.calls.clone()
+    }
+
+    /// Make `breadcrumbs::util::command_exists(name)` report present.
+    pub fn with_command(mut self, name: &str) -> Self {
+        self.commands.insert(name.to_string());
+        self
+    }
+
+    /// Register a canned response: the first registered matcher that returns
+    /// `true` for a given `(prog, args)` supplies the `Output`.
+    pub fn on(mut self, matcher: impl Fn(&str, &[&str]) -> bool + 'static, output: Output) -> Self {
+        self.rules.push((Box::new(matcher), output));
+        self
+    }
+
+    /// Shorthand for matching on `prog` plus a whitespace-joined view of
+    /// `args` containing `substr` (handy for `nmcli`/`tailscale` calls, whose
+    /// interesting bit is usually a subcommand somewhere in the middle).
+    pub fn on_contains(self, prog: &'static str, substr: &'static str, output: Output) -> Self {
+        self.on(
+            move |p, args| p == prog && args.join(" ").contains(substr),
+            output,
+        )
+    }
+}
+
+impl Default for FakeRunner {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Runner for FakeRunner {
+    fn run(&self, prog: &str, args: &[&str], stdin: Option<&str>, _timeout: Duration) -> Output {
+        self.calls.borrow_mut().push(RecordedCall {
+            prog: prog.to_string(),
+            args: args.iter().map(|s| s.to_string()).collect(),
+            stdin: stdin.map(|s| s.to_string()),
+        });
+        for (matcher, out) in &self.rules {
+            if matcher(prog, args) {
+                return out.clone();
+            }
+        }
+        Output::failed()
+    }
+
+    fn command_exists(&self, name: &str) -> bool {
+        self.commands.contains(name)
+    }
+}
+
+pub fn ok(stdout: &str) -> Output {
+    Output {
+        success: true,
+        stdout: stdout.to_string(),
+        stderr: String::new(),
+    }
+}
+
+pub fn ok_empty() -> Output {
+    ok("")
+}
+
+pub fn fail(stderr: &str) -> Output {
+    Output {
+        success: false,
+        stdout: String::new(),
+        stderr: stderr.to_string(),
+    }
+}
+
+fn env_lock() -> &'static Mutex<()> {
+    static LOCK: OnceLock<Mutex<()>> = OnceLock::new();
+    LOCK.get_or_init(|| Mutex::new(()))
+}
+
+static SANDBOX_COUNTER: AtomicU32 = AtomicU32::new(0);
+
+/// Points `HOME` / `XDG_CONFIG_HOME` / `XDG_STATE_HOME` at a throwaway
+/// tempdir for its lifetime, so any real filesystem side effect
+/// (`notify::log`'s best-effort log file, `Config::save`, …) that in-process
+/// logic performs during a test lands there instead of the developer's real
+/// home directory. Holds a process-wide lock for its lifetime — construct
+/// one per test, drop it (or let it go out of scope) before the test ends.
+pub struct EnvSandbox {
+    _guard: MutexGuard<'static, ()>,
+    root: PathBuf,
+    prev: Vec<(&'static str, Option<String>)>,
+}
+
+const ENV_VARS: [&str; 3] = ["HOME", "XDG_CONFIG_HOME", "XDG_STATE_HOME"];
+
+impl EnvSandbox {
+    pub fn new() -> Self {
+        let guard = env_lock().lock().unwrap_or_else(|e| e.into_inner());
+
+        let n = SANDBOX_COUNTER.fetch_add(1, Ordering::SeqCst);
+        let nanos = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
+            .as_nanos();
+        let root = std::env::temp_dir().join(format!(
+            "breadcrumbs-inproc-{}-{}-{}",
+            std::process::id(),
+            n,
+            nanos
+        ));
+        std::fs::create_dir_all(&root).expect("create EnvSandbox root");
+
+        let prev: Vec<(&'static str, Option<String>)> = ENV_VARS
+            .iter()
+            .map(|v| (*v, std::env::var(v).ok()))
+            .collect();
+        std::env::set_var("HOME", &root);
+        std::env::set_var("XDG_CONFIG_HOME", root.join("config"));
+        std::env::set_var("XDG_STATE_HOME", root.join("state"));
+
+        EnvSandbox {
+            _guard: guard,
+            root,
+            prev,
+        }
+    }
+
+    pub fn root(&self) -> &Path {
+        &self.root
+    }
+}
+
+impl Default for EnvSandbox {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Drop for EnvSandbox {
+    fn drop(&mut self) {
+        for (k, v) in &self.prev {
+            match v {
+                Some(val) => std::env::set_var(k, val),
+                None => std::env::remove_var(k),
+            }
+        }
+        let _ = std::fs::remove_dir_all(&self.root);
+    }
+}

tests/flow_watch.rs

@@ -0,0 +1,655 @@
+//! In-process tests for the actual state machine (`flow::run`) and the watch
+//! loop's health classification (`watch::classify`), driven entirely through
+//! a faked `breadcrumbs::util::Runner` (see `tests/common`) — no subprocess
+//! is ever spawned. This complements `tests/cli.rs`'s black-box coverage
+//! (which spawns the real binary against fake-bin shell scripts) with fast,
+//! precise coverage of the logic itself: candidate priority order, the
+//! bootstrap+Tailscale gate, and every `watch::Health` transition.
+
+mod common;
+
+use std::collections::BTreeMap;
+
+use bread_utils::bread_client::BreadEvent;
+use breadcrumbs::bread_events;
+use breadcrumbs::config::{Config, NetworkDef, Profile, Settings};
+use breadcrumbs::flow;
+use breadcrumbs::nm;
+use breadcrumbs::state::{self, State};
+use breadcrumbs::util::with_runner;
+use breadcrumbs::watch::{classify, Health};
+
+use common::{fail, ok, EnvSandbox, FakeRunner};
+
+fn net(ssid: &str, password: Option<&str>) -> NetworkDef {
+    NetworkDef {
+        ssid: ssid.to_string(),
+        password: password.map(str::to_string),
+        hidden: false,
+    }
+}
+
+fn hidden_net(ssid: &str, password: Option<&str>) -> NetworkDef {
+    NetworkDef {
+        ssid: ssid.to_string(),
+        password: password.map(str::to_string),
+        hidden: true,
+    }
+}
+
+fn base_config() -> Config {
+    Config {
+        settings: Settings::default(),
+        networks: Vec::new(),
+        profiles: BTreeMap::new(),
+    }
+}
+
+/// Wires up the nmcli plumbing every `flow::run` call needs regardless of
+/// scenario: a Wi-Fi interface exists, radio/rescan calls are no-ops, no
+/// saved NM connection profiles exist yet (so every connect takes the
+/// "create via `device wifi connect`" path), DNS enforcement succeeds, and
+/// the device reports connected after any successful connect attempt.
+fn base_nm(visible_ssids: &[&str]) -> FakeRunner {
+    let visible = visible_ssids.join("\n");
+    FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "radio wifi on", ok(""))
+        .on_contains("nmcli", "wifi rescan", ok(""))
+        .on_contains("nmcli", "-f SSID device wifi list", ok(&visible))
+        .on_contains("nmcli", "NAME,TYPE", ok("")) // no saved profiles
+        .on_contains("nmcli", "GENERAL.CON-UUID", ok("uuid-1"))
+        .on_contains("nmcli", "ipv4.ignore-auto-dns", ok(""))
+        .on_contains("nmcli", "device reapply", ok(""))
+        .on_contains("nmcli", "DEVICE,STATE", ok("wlan0:connected"))
+}
+
+/// A successful `device wifi connect <ssid> ...` for every ssid in `ssids`.
+fn allow_connects(runner: FakeRunner, ssids: &[&'static str]) -> FakeRunner {
+    ssids.iter().fold(runner, |r, ssid| {
+        let ssid: &'static str = ssid;
+        r.on(
+            move |prog, args| prog == "nmcli" && args.contains(&"connect") && args.contains(&ssid),
+            ok(""),
+        )
+    })
+}
+
+// ---------------------------------------------------------------------
+// flow::run — candidate priority (pass 1 / pass 2)
+// ---------------------------------------------------------------------
+
+#[test]
+fn flow_run_connects_to_first_visible_candidate_in_priority_order() {
+    let _env = EnvSandbox::new();
+
+    let mut cfg = base_config();
+    cfg.networks = vec![net("First", Some("pw1")), net("Second", Some("pw2"))];
+    cfg.profiles.insert(
+        "home".into(),
+        Profile {
+            networks: vec!["First".into(), "Second".into()],
+            ..Default::default()
+        },
+    );
+
+    let runner = allow_connects(base_nm(&["First", "Second"]), &["First", "Second"])
+        .on(|prog, _| prog == "curl", ok("204"))
+        .with_command("curl");
+    let calls = runner.calls_handle();
+
+    let outcome = with_runner(runner, || flow::run(&mut cfg, "home"));
+
+    match outcome {
+        flow::Outcome::Connected { ssid, note } => {
+            assert_eq!(ssid, "First");
+            assert_eq!(note, None);
+        }
+        other => panic!("expected Connected, got {other:?}"),
+    }
+
+    // Priority order actually mattered: "Second" was never dialed even
+    // though it was visible and would have succeeded too.
+    let dialed_second = calls.borrow().iter().any(|c| {
+        c.prog == "nmcli"
+            && c.args.contains(&"connect".to_string())
+            && c.args.iter().any(|a| a == "Second")
+    });
+    assert!(!dialed_second, "connected to Second when First should win");
+
+    // The password used for the winning connect is now NM's problem, not
+    // breadcrumbs' — cleared and (via clear_password_if_used) persisted.
+    assert_eq!(cfg.network("First").unwrap().password, None);
+    // Never touched, so its password is untouched too.
+    assert_eq!(
+        cfg.network("Second").unwrap().password,
+        Some("pw2".to_string())
+    );
+}
+
+#[test]
+fn flow_run_pass2_falls_back_to_hidden_candidate_not_in_scan() {
+    let _env = EnvSandbox::new();
+
+    let mut cfg = base_config();
+    // "Ghost" is neither visible nor hidden, so pass 1 *and* pass 2 both
+    // skip it outright — it should never be dialed.
+    cfg.networks = vec![
+        net("Ghost", Some("pw-ghost")),
+        hidden_net("Shadow", Some("pw-shadow")),
+    ];
+    cfg.profiles.insert(
+        "away".into(),
+        Profile {
+            networks: vec!["Ghost".into(), "Shadow".into()],
+            ..Default::default()
+        },
+    );
+
+    // Neither SSID shows up in the scan — "Shadow" is only reachable via the
+    // pass-2 "hidden and unseen" path.
+    let runner = allow_connects(base_nm(&[]), &["Shadow"])
+        .on(|prog, _| prog == "curl", ok("204"))
+        .with_command("curl");
+    let calls = runner.calls_handle();
+
+    let outcome = with_runner(runner, || flow::run(&mut cfg, "away"));
+
+    match outcome {
+        flow::Outcome::Connected { ssid, .. } => assert_eq!(ssid, "Shadow"),
+        other => panic!("expected Connected to Shadow, got {other:?}"),
+    }
+    let dialed_ghost = calls
+        .borrow()
+        .iter()
+        .any(|c| c.args.iter().any(|a| a == "Ghost") && c.args.contains(&"connect".to_string()));
+    assert!(!dialed_ghost, "Ghost should never have been dialed");
+}
+
+#[test]
+fn flow_run_unknown_profile_short_circuits_before_touching_nm() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+
+    let runner = FakeRunner::new(); // no rules at all
+    let calls = runner.calls_handle();
+
+    let outcome = with_runner(runner, || flow::run(&mut cfg, "does-not-exist"));
+
+    assert!(matches!(outcome, flow::Outcome::UnknownProfile(p) if p == "does-not-exist"));
+    // The only `Runner::run` call on this path is `notify`/`log`'s own
+    // `date` timestamp lookup — nmcli (or anything network-related) is
+    // never touched for a profile that doesn't exist.
+    assert!(
+        calls.borrow().iter().all(|c| c.prog != "nmcli"),
+        "unknown-profile path should never shell out to nmcli: {:?}",
+        calls.borrow()
+    );
+}
+
+// ---------------------------------------------------------------------
+// flow::run — bootstrap + Tailscale gating
+// ---------------------------------------------------------------------
+
+fn tailscale_json_ok(exit_node: &str) -> String {
+    format!(
+        r#"{{"BackendState":"Running","Peer":{{"k1":{{"HostName":"{exit_node}","DNSName":"{exit_node}.ts.net.","Online":true,"ExitNode":true,"ExitNodeOption":true}}}}}}"#
+    )
+}
+
+fn tailscale_json_missing() -> &'static str {
+    r#"{"BackendState":"Running","Peer":{}}"#
+}
+
+#[test]
+fn flow_run_moves_past_bootstrap_once_tailscale_is_healthy() {
+    let _env = EnvSandbox::new();
+
+    let mut cfg = base_config();
+    cfg.settings.exit_node = "exitnode".into();
+    cfg.networks = vec![net("Guest", Some("guest-pw")), net("Corp", Some("corp-pw"))];
+    cfg.profiles.insert(
+        "work".into(),
+        Profile {
+            bootstrap: Some("Guest".into()),
+            networks: vec!["Corp".into()],
+            tailscale: true,
+            ..Default::default()
+        },
+    );
+
+    let runner = allow_connects(base_nm(&["Guest", "Corp"]), &["Guest", "Corp"])
+        .with_command("curl")
+        .with_command("tailscale")
+        .on(|prog, _| prog == "curl", ok("204"))
+        .on_contains("tailscale", "status", ok(&tailscale_json_ok("exitnode")))
+        .on_contains("tailscale", "set", ok(""));
+    let calls = runner.calls_handle();
+
+    let outcome = with_runner(runner, || flow::run(&mut cfg, "work"));
+
+    match outcome {
+        flow::Outcome::Connected { ssid, .. } => assert_eq!(ssid, "Corp"),
+        other => panic!("expected Connected to Corp, got {other:?}"),
+    }
+    // Both the bootstrap and target connects used a local password, so both
+    // should have been cleared once NetworkManager took over.
+    assert_eq!(cfg.network("Guest").unwrap().password, None);
+    assert_eq!(cfg.network("Corp").unwrap().password, None);
+
+    let dialed_guest = calls
+        .borrow()
+        .iter()
+        .any(|c| c.args.iter().any(|a| a == "Guest") && c.args.contains(&"connect".to_string()));
+    assert!(dialed_guest, "bootstrap should have been dialed first");
+}
+
+#[test]
+fn flow_run_stays_on_bootstrap_and_never_dials_target_when_tailscale_unhealthy() {
+    let _env = EnvSandbox::new();
+
+    let mut cfg = base_config();
+    cfg.settings.exit_node = "exitnode".into();
+    cfg.networks = vec![net("Guest", Some("guest-pw")), net("Corp", Some("corp-pw"))];
+    cfg.profiles.insert(
+        "work".into(),
+        Profile {
+            bootstrap: Some("Guest".into()),
+            networks: vec!["Corp".into()],
+            tailscale: true,
+            ..Default::default()
+        },
+    );
+
+    let runner = allow_connects(base_nm(&["Guest", "Corp"]), &["Guest", "Corp"])
+        .with_command("curl")
+        .with_command("tailscale")
+        .on(|prog, _| prog == "curl", ok("204"))
+        .on(
+            |prog, args| prog == "tailscale" && args.contains(&"status"),
+            ok(tailscale_json_missing()),
+        )
+        .on(
+            |prog, args| prog == "tailscale" && args.contains(&"set"),
+            ok(""),
+        );
+    let calls = runner.calls_handle();
+
+    let outcome = with_runner(runner, || flow::run(&mut cfg, "work"));
+
+    match &outcome {
+        flow::Outcome::TailscaleError { ssid, health } => {
+            assert_eq!(ssid.as_deref(), Some("Guest"));
+            assert_eq!(*health, breadcrumbs::tailscale::TsHealth::ExitNodeMissing);
+        }
+        other => panic!("expected TailscaleError, got {other:?}"),
+    }
+
+    let dialed_corp = calls
+        .borrow()
+        .iter()
+        .any(|c| c.args.iter().any(|a| a == "Corp") && c.args.contains(&"connect".to_string()));
+    assert!(
+        !dialed_corp,
+        "target network must never be dialed while Tailscale is unhealthy"
+    );
+    // The bootstrap connect *did* use a password and succeeded, so it's
+    // cleared even though the overall flow ends in an error.
+    assert_eq!(cfg.network("Guest").unwrap().password, None);
+}
+
+// ---------------------------------------------------------------------
+// watch::classify — health-state transitions
+// ---------------------------------------------------------------------
+
+#[test]
+fn classify_reports_unknown_profile_without_touching_nm() {
+    let _env = EnvSandbox::new();
+    let cfg = base_config(); // no profiles at all
+
+    let runner = FakeRunner::new();
+    let calls = runner.calls_handle();
+    let (health, ssid) = with_runner(runner, || classify(&cfg, "ghost"));
+
+    assert_eq!(health, Health::UnknownProfile);
+    assert_eq!(ssid, None);
+    assert!(calls.borrow().is_empty());
+}
+
+#[test]
+fn classify_reports_no_adapter_when_wifi_interface_absent() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.profiles.insert("away".into(), Profile::default());
+
+    // `device status` succeeds but lists no wifi-type device.
+    let runner = FakeRunner::new().on_contains("nmcli", "DEVICE,TYPE", ok("eth0:ethernet"));
+    let (health, _) = with_runner(runner, || classify(&cfg, "away"));
+
+    assert_eq!(health, Health::NoAdapter);
+}
+
+#[test]
+fn classify_reports_down_no_net_when_internet_check_fails() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.profiles.insert("away".into(), Profile::default());
+
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "ACTIVE,SSID", ok("yes:HomeWifi"))
+        .on_contains("nmcli", "IP4.ADDRESS", ok("192.168.1.50/24"))
+        .on(|prog, _| prog == "curl" || prog == "ping", fail(""));
+    let (health, ssid) = with_runner(runner, || classify(&cfg, "away"));
+
+    assert_eq!(health, Health::DownNoNet);
+    assert_eq!(ssid, Some("HomeWifi".to_string()));
+}
+
+#[test]
+fn classify_reports_up_when_healthy_and_tailscale_not_required() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.profiles.insert("home".into(), Profile::default()); // tailscale: false
+
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "ACTIVE,SSID", ok("yes:HomeWifi"))
+        .on_contains("nmcli", "IP4.ADDRESS", ok("192.168.1.50/24"))
+        .with_command("curl")
+        .on(|prog, _| prog == "curl", ok("204"));
+    let (health, ssid) = with_runner(runner, || classify(&cfg, "home"));
+
+    assert_eq!(health, Health::Up);
+    assert_eq!(ssid, Some("HomeWifi".to_string()));
+}
+
+#[test]
+fn classify_reports_down_tailscale_manual_when_not_installed() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.profiles.insert(
+        "work".into(),
+        Profile {
+            tailscale: true,
+            ..Default::default()
+        },
+    );
+
+    // No `with_command("tailscale")`, so `tailscale::installed()` is false —
+    // `status::gather` never even tries to run the `tailscale` binary.
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "ACTIVE,SSID", ok("yes:CorpWifi"))
+        .on_contains("nmcli", "IP4.ADDRESS", ok("10.0.0.5/24"))
+        .with_command("curl")
+        .on(|prog, _| prog == "curl", ok("204"));
+    let (health, _) = with_runner(runner, || classify(&cfg, "work"));
+
+    assert_eq!(health, Health::DownTailscaleManual);
+}
+
+#[test]
+fn classify_reports_down_tailscale_manual_when_needs_login() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.profiles.insert(
+        "work".into(),
+        Profile {
+            tailscale: true,
+            ..Default::default()
+        },
+    );
+
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "ACTIVE,SSID", ok("yes:CorpWifi"))
+        .on_contains("nmcli", "IP4.ADDRESS", ok("10.0.0.5/24"))
+        .with_command("curl")
+        .with_command("tailscale")
+        .on(|prog, _| prog == "curl", ok("204"))
+        .on(
+            |prog, args| prog == "tailscale" && args.contains(&"status"),
+            ok(r#"{"BackendState":"NeedsLogin"}"#),
+        );
+    let (health, _) = with_runner(runner, || classify(&cfg, "work"));
+
+    assert_eq!(health, Health::DownTailscaleManual);
+}
+
+#[test]
+fn classify_reports_down_tailscale_other_when_exit_node_offline() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.settings.exit_node = "exitnode".into();
+    cfg.profiles.insert(
+        "work".into(),
+        Profile {
+            tailscale: true,
+            ..Default::default()
+        },
+    );
+
+    let json = r#"{"BackendState":"Running","Peer":{"k1":{"HostName":"exitnode","Online":false,"ExitNode":false,"ExitNodeOption":true}}}"#;
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "ACTIVE,SSID", ok("yes:CorpWifi"))
+        .on_contains("nmcli", "IP4.ADDRESS", ok("10.0.0.5/24"))
+        .with_command("curl")
+        .with_command("tailscale")
+        .on(|prog, _| prog == "curl", ok("204"))
+        .on(
+            |prog, args| prog == "tailscale" && args.contains(&"status"),
+            ok(json),
+        );
+    let (health, _) = with_runner(runner, || classify(&cfg, "work"));
+
+    assert_eq!(health, Health::DownTailscaleOther);
+}
+
+#[test]
+fn classify_reports_up_when_tailscale_healthy() {
+    let _env = EnvSandbox::new();
+    let mut cfg = base_config();
+    cfg.settings.exit_node = "exitnode".into();
+    cfg.profiles.insert(
+        "work".into(),
+        Profile {
+            tailscale: true,
+            ..Default::default()
+        },
+    );
+
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "DEVICE,TYPE", ok("wlan0:wifi"))
+        .on_contains("nmcli", "ACTIVE,SSID", ok("yes:CorpWifi"))
+        .on_contains("nmcli", "IP4.ADDRESS", ok("10.0.0.5/24"))
+        .with_command("curl")
+        .with_command("tailscale")
+        .on(|prog, _| prog == "curl", ok("204"))
+        .on_contains("tailscale", "status", ok(&tailscale_json_ok("exitnode")));
+    let (health, _) = with_runner(runner, || classify(&cfg, "work"));
+
+    assert_eq!(health, Health::Up);
+}
+
+// ---------------------------------------------------------------------
+// bread.command.crumbs.set_profile — persists via the same path as the
+// CLI, and must not depend on breadd being reachable (`emit` is
+// fire-and-forget).
+// ---------------------------------------------------------------------
+
+fn command_event(event: &str, data: serde_json::Value) -> BreadEvent {
+    BreadEvent {
+        event: event.to_string(),
+        timestamp: 0,
+        data,
+    }
+}
+
+#[test]
+fn set_profile_command_persists_even_with_no_daemon_reachable() {
+    let _env = EnvSandbox::new();
+    let cfg = Config::load().expect("fresh config");
+    state::set_profile(&cfg, "away").unwrap();
+    assert_eq!(State::load("away").profile, "away");
+
+    let acted = bread_events::handle_command(&command_event(
+        "bread.command.crumbs.set_profile",
+        serde_json::json!({ "profile": "home" }),
+    ));
+
+    assert!(acted, "known profile must persist");
+    assert_eq!(State::load("away").profile, "home");
+}
+
+#[test]
+fn set_profile_command_rejects_unknown_profile() {
+    let _env = EnvSandbox::new();
+    let cfg = Config::load().expect("fresh config");
+    state::set_profile(&cfg, "away").unwrap();
+
+    let acted = bread_events::handle_command(&command_event(
+        "bread.command.crumbs.set_profile",
+        serde_json::json!({ "profile": "bogus" }),
+    ));
+
+    assert!(!acted);
+    assert_eq!(
+        State::load("away").profile,
+        "away",
+        "a rejected set_profile must not touch state"
+    );
+}
+
+#[test]
+fn set_profile_command_rejects_missing_profile_field() {
+    let _env = EnvSandbox::new();
+    let cfg = Config::load().expect("fresh config");
+    state::set_profile(&cfg, "away").unwrap();
+
+    let acted = bread_events::handle_command(&command_event(
+        "bread.command.crumbs.set_profile",
+        serde_json::json!({}),
+    ));
+
+    assert!(!acted);
+    assert_eq!(State::load("away").profile, "away");
+}
+
+#[test]
+fn handle_command_ignores_unrecognized_verb() {
+    let _env = EnvSandbox::new();
+    let cfg = Config::load().expect("fresh config");
+    state::set_profile(&cfg, "away").unwrap();
+
+    let acted = bread_events::handle_command(&command_event(
+        "bread.command.crumbs.pin",
+        serde_json::json!({}),
+    ));
+
+    assert!(!acted);
+    assert_eq!(
+        State::load("away").profile,
+        "away",
+        "an unrecognized verb must not touch state"
+    );
+}
+
+#[test]
+fn handle_command_ignores_events_outside_its_own_command_namespace() {
+    let _env = EnvSandbox::new();
+    let cfg = Config::load().expect("fresh config");
+    state::set_profile(&cfg, "away").unwrap();
+
+    assert!(!bread_events::handle_command(&command_event(
+        "bread.command.clip.clear",
+        serde_json::json!({}),
+    )));
+    assert!(!bread_events::handle_command(&command_event(
+        "bread.crumbs.profile.changed",
+        serde_json::json!({ "from": "away", "to": "home" }),
+    )));
+    assert_eq!(State::load("away").profile, "away");
+}
+
+// ---------------------------------------------------------------------
+// PSK never on argv (first connect feeds nmcli --ask on stdin)
+// ---------------------------------------------------------------------
+
+fn assert_psk_not_on_argv(calls: &[common::RecordedCall], psk: &str) {
+    for c in calls {
+        if c.prog != "nmcli" {
+            continue;
+        }
+        assert!(
+            !c.args.iter().any(|a| a == psk),
+            "PSK leaked onto nmcli argv: {:?}",
+            c.args
+        );
+    }
+}
+
+#[test]
+fn connect_verbose_create_feeds_psk_on_stdin_never_argv() {
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "NAME,TYPE", ok(""))
+        .on_contains("nmcli", "connect", ok(""))
+        .on_contains("nmcli", "GENERAL.CON-UUID", ok("uuid-1"))
+        .on_contains("nmcli", "ipv4.ignore-auto-dns", ok(""))
+        .on_contains("nmcli", "device reapply", ok(""));
+    let calls = runner.calls_handle();
+
+    let net = net("Cafe", Some("super-secret-psk"));
+    let result = with_runner(runner, || nm::connect_verbose("wlan0", &net, 8, "1.1.1.1"));
+    assert!(result.is_ok(), "{result:?}");
+
+    let calls = calls.borrow();
+    assert_psk_not_on_argv(&calls, "super-secret-psk");
+    let connect = calls
+        .iter()
+        .find(|c| c.prog == "nmcli" && c.args.iter().any(|a| a == "connect"))
+        .expect("expected device wifi connect");
+    assert!(
+        connect.args.iter().any(|a| a == "--ask"),
+        "create path must use --ask: {:?}",
+        connect.args
+    );
+    assert_eq!(connect.stdin.as_deref(), Some("super-secret-psk\n"));
+}
+
+#[test]
+fn connect_verbose_reuse_feeds_psk_on_stdin_never_argv() {
+    let runner = FakeRunner::new()
+        .on_contains("nmcli", "NAME,TYPE", ok("Cafe:802-11-wireless"))
+        .on_contains("nmcli", "connection modify", ok(""))
+        .on_contains("nmcli", "connection up", ok(""))
+        .on_contains("nmcli", "GENERAL.CON-UUID", ok("uuid-1"))
+        .on_contains("nmcli", "ipv4.ignore-auto-dns", ok(""))
+        .on_contains("nmcli", "device reapply", ok(""));
+    let calls = runner.calls_handle();
+
+    let net = net("Cafe", Some("super-secret-psk"));
+    let result = with_runner(runner, || nm::connect_verbose("wlan0", &net, 8, "1.1.1.1"));
+    assert!(result.is_ok(), "{result:?}");
+
+    let calls = calls.borrow();
+    assert_psk_not_on_argv(&calls, "super-secret-psk");
+    let up = calls
+        .iter()
+        .find(|c| c.prog == "nmcli" && c.args.iter().any(|a| a == "up"))
+        .expect("expected connection up");
+    assert!(
+        up.args.iter().any(|a| a == "--ask"),
+        "reuse path must use --ask: {:?}",
+        up.args
+    );
+    assert_eq!(up.stdin.as_deref(), Some("super-secret-psk\n"));
+    // Clearing the stored PSK uses an empty argv value, never the secret.
+    let cleared = calls.iter().any(|c| {
+        c.prog == "nmcli"
+            && c.args.iter().any(|a| a == "802-11-wireless-security.psk")
+            && c.args.last().is_some_and(|a| a.is_empty())
+    });
+    assert!(cleared, "reuse+password should reset stored PSK: {calls:?}");
+}