Three coupled fixes to make `pnpm test:full` exit cleanly when the local
`fn` dashboard is running:
1. scripts/check-test-isolation.mjs — replace timing-based "is the
engine writing?" heuristic with a deterministic check: if
`.fusion/engine.lock.lock/` exists (proper-lockfile's held-lock
marker), the dir is engine-active and auto-skipped from violation
reporting. The 2-second mutability probe is retained as a backstop
for dirs with another external writer but no live lock. Also adds
`engine.lock` / `engine.lock.lock/` to RUNTIME_IGNORE_PATTERNS so
a mid-test engine start/stop doesn't trip the signature compare.
2. packages/dashboard/.../__tests__/GitManagerModal.test.tsx — prune
the Status-panel Sync button + Recent-advances-events describe
blocks. Their UI was removed in 5d35b64bd ("remove duplicate
integration-advances UI") but the tests stayed and were timing
out at 1s each. The Remotes-panel Sync describe is kept because
the `remotes-sync-integration-tip-btn` still exists.
3. packages/engine/.../merge-reuse-task-worktree.slow.test.ts —
update the happy-path assertion to reflect 4c31e885b
("merger auto-syncs project-root checkout after ref advance").
Before that change, the merger's `update-ref` advance left the
project root's working tree stale, so `git status --porcelain`
would differ after the merge. With auto-sync, the new file is
tracked + clean at HEAD, so status doesn't change. Verify the
file actually landed via `git ls-files` instead.
After this, `pnpm test:full` exits 0 with the local dashboard running.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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