## Summary
The file-size ratchet tests (`scripts/check-file-sizes-core.test.mjs`,
run by `just file-size-check`) created fixture git repos under the OS
tmpdir and never deleted them. When `core.fsmonitor=true` is set
globally, every git call in a fixture also started a `git
fsmonitor--daemon` that never exited. So every run left more temp repos
and more daemons behind.
- The test's `git()` helper now passes `-c core.fsmonitor=false`, next
to the existing `core.hooksPath` override.
- Fixture repos are now created through a new `createFixtureRepo()`
helper, which records each path. An `after()` hook deletes them all with
`rmSync(..., { recursive: true, force: true })`.
The other scripts that create temp git repos
(`scripts/ci-selection.test.mjs`, `scripts/flake-check.test.mjs`,
`scripts/test-mobile-release-contract.sh`,
`scripts/test-sprig-image.sh`) already clean up their temp directories
and left no daemons running, so they are unchanged.
## Testing
- `node --test scripts/check-file-sizes-core.test.mjs`: no `file-size-*`
directories are left in the tmpdir afterwards, and no new
`fsmonitor--daemon` processes are running.
- The pre-push `file-size-check` lane passes.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Signed-off-by: Matt Toohey <contact@matttoohey.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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