Add systemd --user service for the watch daemon

breadcrumbs had a watch subcommand meant to run continuously but no
systemd unit anywhere, so bakery installs never actually started it -
Wi-Fi profile config in bos-settings had no daemon consuming it.

.forgejo/workflows/release.yml

@@ -33,6 +33,7 @@ jobs:
             > "${PKG_DIR}/breadcrumbs-x86_64.sha256"
           cp src/breadcrumbs.example.toml "${PKG_DIR}/"
           cp src/bakery.toml "${PKG_DIR}/bakery.toml"
+          cp src/contrib/breadcrumbs.service "${PKG_DIR}/"
           ln -sfn "${VERSION}" "/srv/breadway-dl/breadcrumbs/latest"
 
       - name: regenerate index.json

Cargo.lock

@@ -54,7 +54,7 @@ dependencies = [
 
 [[package]]
 name = "breadcrumbs"
-version = "2.1.1"
+version = "2.1.2"
 dependencies = [
  "clap",
  "serde",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "breadcrumbs"
-version = "2.1.1"
+version = "2.1.2"
 edition = "2021"
 description = "Profile-aware Wi-Fi state machine with Tailscale handling and self-healing watch daemon"
 license = "MIT"

bakery.toml

@@ -9,5 +9,11 @@ bread_deps = []
 dir = "~/.config/breadcrumbs"
 example = "breadcrumbs.example.toml"
 
+[[service]]
+unit = "breadcrumbs.service"
+enable = true
+
 [install]
-post_install = []
+post_install = [
+    "systemctl --user is-active --quiet breadcrumbs || systemctl --user start breadcrumbs",
+]

contrib/breadcrumbs.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=breadcrumbs Wi-Fi state machine watcher
+Documentation=https://git.breadway.dev/Breadway/breadcrumbs
+After=network.target NetworkManager.service graphical-session.target
+Wants=network.target graphical-session.target
+
+[Service]
+Type=simple
+# ExecStart is rewritten at install time by bakery to point at the real
+# bin_dir (patch_exec_start in bakery's install.rs) — this path is only a
+# placeholder for local testing.
+ExecStart=%h/.local/bin/breadcrumbs watch
+Restart=always
+RestartSec=5
+Nice=5
+
+# Forward stdout/stderr to the journal so `journalctl --user -u breadcrumbs` works
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=graphical-session.target