fix(core): restore parcel watch for git HEAD - #41616
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Bun fs.watch misses git's atomic HEAD.lock rename, so checkout never refreshed the cached branch. Watch the git dir with Parcel like dev, keeping only HEAD and HEAD.lock.
LocationWatcher only existed to republish git/hg metadata as filesystem.changed for Vcs. Nothing else consumed those events. Vcs now owns the Parcel watch, same as skills and config.
This was referenced Aug 11, 2026
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What
git checkoutno longer updates the TUI/server branch label. #41096 stopped the recursive project watch (good) but also replaced the bounded.gitParcel watch with a Bunfs.watchon theHEADfile.Git updates
HEADby renamingHEAD.lock→HEAD. Parcel/FSEvents sees that; Bun'sfs.watchdoes not (Node does). Vcs never refreshes, sovcs.branch.updatednever fires and the boot-time branch sticks. Existing tests still passed because they writeHEADin place.devalready does the tight version: one Parcel watch on the git dir, ignore everything exceptHEAD. This restores that, plusHEAD.lock, without bringing back the whole-tree watch.Test plan
cd packages/core && bun test test/filesystem/watcher.test.ts test/vcs.test.tsopencode2 service restart, thengit checkoutand confirm the TUI branch label updates