## Summary
- update workspace worktree test stores for callback-based entry
mutations
- preserve validation, existing-entry, and singular-routing behavior in
the fakes
- canonicalize the macOS worktree path fixture before comparing
persisted state
- remove the stale inert-seam exception left after the review-column
callback became fully supplied
## Test plan
- `pnpm --filter @fusion/engine exec vitest run
src/__tests__/node-worktree-isolation.test.ts
src/__tests__/workspace-root-worktree-routing.test.ts
src/__tests__/worktree-acquisition.test.ts --silent=passed-only
--reporter=dot`
- `pnpm --filter @fusion/engine exec vitest run
src/__tests__/worktree-acquisition-workspace.test.ts
--silent=passed-only --reporter=dot`
- Directly changed engine workspace suite with PostgreSQL-dependent
blocks skipped: 338 passed, 4 skipped
- `pnpm --filter @fusion/engine typecheck`
- `node scripts/check-inert-flag-seams.mjs`
- `node --test scripts/__tests__/check-inert-flag-seams.test.mjs`
- `pnpm lint`
- `pnpm check:changesets`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Improved recovery of orphaned worktrees by consistently using
canonical paths.
* Strengthened worktree assignment and updates to preserve existing
entries and prevent stale task state.
* Improved synchronization and validation during concurrent workspace
updates.
* Refined self-healing recovery so branch metadata changes only when
necessary.
* Improved handling of stalled tasks, retry exhaustion, and clearing
obsolete worktree or branch information.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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