Pin bread-ecosystem crates to v0.7.1 and document single-trunk + overlay split

bread-theme and bread-onnx now come from git.breadway.dev tag v0.7.1
(gtk feature on theme). bread-screenshots is not on that tag, so it is
pinned to rev f86e299 instead of branch=main. CLAUDE.md tracks the
single-trunk release model; README states breadsearch is document/meaning
search and is not breadbox's app-launcher overlay.

CLAUDE.md

@@ -0,0 +1,50 @@
+# CLAUDE.md — Repo hygiene
+
+Scope: this file covers *repo hygiene* — branching, remotes, CI — plus a
+short map of the binaries. It is not user-facing 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.
+
+When starting work on a new feature, create branch `feature/<feature-name>`.
+When working on a bug or issue, create branch `fix/<issue you are fixing>`.
+
+## Remotes
+- `origin` — Forgejo (`git.breadway.dev` via Hestia, SSH) — authoritative.
+- `github` — GitHub mirror. Push both when publishing.
+
+## CI
+- `dev-release.yml` triggers on `push: branches: ['main']`.
+- `rc-release.yml` triggers on `vX.Y.Z-rc.N` tag pushes (beta track).
+- `release.yml` triggers on any other `v*` tag push (stable).
+  None of these run on plain commits or PRs beyond what's listed.
+
+## Architecture
+
+Two binaries + a shared lib:
+
+| Crate | Role |
+|---|---|
+| `breadsearch-shared` | XDG paths, config, IPC types, Unix-socket client |
+| `breadmill` | Daemon: walk → extract → chunk → embed → index; serves queries |
+| `breadsearch` | GTK4 layer-shell overlay: ranked document hits from breadmill |
+
+breadsearch is document/meaning search. breadbox is the app launcher. They
+are not the same overlay.
+
+`--screenshot` (`breadsearch/src/screenshot.rs`) captures the search panel
+through `bread-screenshots`; do not rewrite it just to retarget the crate pin.
+
+## Don't
+- Don't embed credentials in remote URLs — SSH or a credential helper only.
+- Don't rewrite `screenshot.rs` as part of pin/docs work.