## Summary
- serialize pinned-path classification, orphan preservation, quarantine
reconciliation, and recreation under one reservation
- preserve cross-filesystem orphans atomically beside the configured
worktree root and retain the newest 10 generated entries per recovery
root
- exclude recovery containers from pool and self-healing scans, with
fail-closed symlink and active-session guards
- document recovery location and retention behavior
## Test plan
- `pnpm --filter @fusion/engine exec vitest run
src/__tests__/worktree-acquisition.test.ts
src/__tests__/worktree-paths.test.ts src/__tests__/worktree-pool.test.ts
src/__tests__/self-healing-tempdir-sweep.test.ts --silent=passed-only
--reporter=dot`
- `pnpm --filter @fusion/engine typecheck`
- `pnpm --filter @fusion/engine build`
- `pnpm test:gate:static`
- `pnpm check:changesets --strict`
- `pnpm check:fnxc-future-dates`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Preserves orphaned pinned worktrees during recovery, including across
filesystems.
* Retains the 10 most recent recovery entries and safely skips active or
invalid entries.
* Keeps recovery data separate from normal worktree discovery, cleanup,
and capacity checks.
* Adds safeguards for path containment, active-session ownership, and
concurrent recovery.
* **Bug Fixes**
* Prevents pinned worktree data from being lost during recreation or
quarantine cleanup.
* Ensures recovery cleanup failures do not interrupt worktree
acquisition.
* **Documentation**
* Documented orphan recovery, retention, fallback behavior, and cleanup
safeguards.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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