**Category:** improvement
**User Impact:** Developers can identify which worktree produced a
mobile debug app, keep a bounded set of worktree builds installed side
by side, and preserve each worktree app's login and local state while
switching branches.
**Problem:** Mobile debug builds from every checkout currently appear as
the same “Buzz” app and share one application identity, so the running
source is ambiguous and one worktree build replaces another. A
branch-keyed identity would avoid replacement but create stale installs
and fresh app state on every branch switch.
**Solution:** Give each linked worktree a stable Debug-only application
identity derived from its sanitized directory name. Show the sanitized
branch name (or short commit SHA when detached) in the display label,
persist generated native overrides for direct IDE builds, and leave
Release/Profile identities unchanged. Worktree defaults remain lower
precedence than a developer's iOS `AppOverrides.xcconfig`. `just
mobile-clean` provides a safe cleanup path for suffixed worktree
installs while preserving production Buzz.
<details>
<summary>File changes</summary>
**.github/workflows/ci.yml**
Runs the expanded worktree override contract when relevant mobile or
native configuration changes.
**AGENTS.md**
Documents worktree-aware mobile development and cleanup for contributors
and agents.
**Justfile**
Generates overrides before mobile development and Android debug builds,
and exposes `just mobile-clean`.
**mobile/README.md**
Explains stable per-worktree identities, branch/SHA labels, direct IDE
usage, cleanup, and Release/Profile guarantees.
**mobile/android/.gitignore**
Ignores generated worktree properties.
**mobile/android/app/build.gradle.kts**
Loads and validates generated properties, then applies the application
ID suffix and display label to Android Debug only.
**mobile/android/app/src/main/AndroidManifest.xml**
Resolves the Android app label through an overridable string resource.
**mobile/ios/.gitignore**
Ignores generated iOS worktree settings.
**mobile/ios/Flutter/Debug.xcconfig**
Loads generated worktree defaults before developer `AppOverrides`, so
personal signing overrides retain precedence.
**mobile/ios/Flutter/Release.xcconfig**
Pins the production display name and bundle identifier for
Release/Profile builds.
**mobile/ios/Runner/Info.plist**
Resolves the visible iOS app name from build settings.
**scripts/mobile-worktree-overrides.sh**
Detects linked worktrees, derives a stable directory-keyed identity,
sanitizes branch/SHA display context, writes native Debug overrides, and
removes stale overrides in the main checkout.
**scripts/mobile-worktree-clean.sh**
Lists or removes suffixed Buzz worktree installs from booted iOS
simulators and connected Android emulators without matching production
IDs; supports `--dry-run`.
**scripts/test-mobile-worktree-overrides.sh**
Covers worktree detection, branch-switch identity stability, detached
HEAD fallback, special-character sanitization, iOS override precedence,
brace-aware Release/Profile purity, cleanup safety, ignores, and command
integration.
</details>
## Reproduction steps
1. From a linked worktree, activate the repository toolchain and run
`just mobile-dev`.
2. Inspect the running app: its label should be `Buzz
(<sanitized-branch>)`, while its application ID suffix is derived from
the worktree directory.
3. Switch branches in the same worktree, rerun the override script, and
confirm the application ID remains stable while the display label
updates. In detached HEAD, confirm the label uses a short SHA.
4. Build Debug from a second worktree and confirm both apps remain
installed side by side with independent state.
5. Build from Xcode after setting `AppOverrides.xcconfig` and confirm
developer overrides still win over generated worktree defaults.
6. Run `just mobile-clean --dry-run`, then `just mobile-clean`, and
confirm suffixed worktree installs are targeted while the production app
is preserved.
7. Build Release/Profile and confirm the production name and application
identity remain unchanged.
8. Run `scripts/test-mobile-worktree-overrides.sh`, `just mobile-check`,
`just mobile-test`, and `just mobile-build-android`.
## Screenshots / demos
| iOS — labeled app switcher | iOS — side-by-side installs |
| --- | --- |
| <img width="360" alt="Buzz worktree label in the iOS app switcher"
src="https://github.com/user-attachments/assets/4bcae067-7ce5-4333-bb11-2803c4107663"
/> | <img width="360" alt="Buzz production and worktree debug apps
installed side by side on iOS"
src="https://github.com/user-attachments/assets/08a107b5-fdf2-463a-8a4c-81d41d7bf5e7"
/> |
| Android — side-by-side installs | Android — labeled app switcher |
| --- | --- |
| <img width="360" alt="Buzz production and worktree debug apps
installed side by side on Android"
src="https://github.com/user-attachments/assets/4f5841a1-adae-42da-ae84-47c09ec85fb9"
/> | <img width="360" alt="Buzz worktree label in the Android app
switcher"
src="https://github.com/user-attachments/assets/0546ff51-efcc-4cb6-a4bd-2a3af26cd60f"
/> |
---------
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>
Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@buzz.block.builderlab.xyz>
`DCO Check` is a required status check on this repo and the top failing
check on open contributor PRs, but nothing documented it and nothing
surfaced it locally — a missing `Signed-off-by` trailer only showed up
as a red check after the PR was already open.
## `lefthook.yml`
New `commit-msg` hook that appends the `Signed-off-by` trailer:
```yaml
commit-msg:
commands:
signoff:
run: 'git interpret-trailers --if-exists doNothing --trailer "Signed-off-by: $(git var GIT_COMMITTER_IDENT | sed ''s/ [0-9]* [+-][0-9]*$//'')" --in-place {1}'
```
`GIT_COMMITTER_IDENT` is the identity that performed the commit, which
is what a DCO sign-off certifies and what native `git commit -s` uses.
Committing someone else's work with `--author` or `git commit -C`
therefore signs off as you, not as the original author.
`--if-exists doNothing` makes it idempotent: `git commit -s` still
yields exactly one trailer, and an existing sign-off from a different
signer is preserved rather than supplemented. An empty commit message
still aborts — the hook does not turn one into a commit body containing
only a trailer.
Git runs `commit-msg` for `git commit` and `git merge` only. Other flows
bypass it and need their own sign-off flag — `git rebase --signoff`,
`git cherry-pick -s`. Note `-s` is `--strategy` on `git rebase`, so only
the long flag works there. The header comment and both docs state the
scope rather than promising blanket coverage. Installed by `just hooks`;
`commit-msg` carries no `glob` because it rewrites the message, not
files.
## `CONTRIBUTING.md`
`Before You Open a PR` gains a paragraph on sign-off: commit with `git
commit -s`, what the trailer certifies, that the required `DCO Check`
blocks merge without it, `git rebase --signoff main` to repair
already-pushed commits, and what the hook does and does not cover.
`CI Gate` gains one sentence pointing at `just fix-all` for
formatting-only failures.
## `AGENTS.md`
`Quality Gates` gains the same requirement framed for agents, including
the sequencer caveat and the reminder to include `-s` in
programmatically built commit commands.
## Related issue
none found
---------
Signed-off-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>
## Summary
- Activate lefthook pre-commit and pre-push hooks that have existed in `lefthook.yml` since the initial desktop app but were never wired up.
- Add `just hooks` recipe: sets `core.hooksPath = .hooks` and runs `lefthook install --force` to generate hook scripts.
- Wire hook installation into `scripts/dev-setup.sh` so hooks activate automatically on `just setup`.
- Enable `parallel: true` for pre-commit hooks (pre-push already had it) — all 5 format/lint checks run simultaneously.
- Add `just mobile-fmt` recipe (`dart format .`) and `just fmt-all` recipe (Rust root + Tauri Rust + Dart) as one-shot formatters.
- `.hooks/` is gitignored since lefthook generates machine-specific scripts.
- Update `AGENTS.md`: document pre-commit/pre-push hooks in Quality Gates, add `just fmt-all` and `just hooks` usage, upgrade worktree fmt gotcha from CI note to commit blocker, add `just mobile-fmt` to mobile commands; also backfill CLI-first updates (`SPROUT_AUTH_TAG`, complete exit codes, `--format compact` flag position, two new gotchas).
All hook commands delegate to `just` recipes as the single source of truth.
