## Summary
- persist engine branch-write provenance when reclaiming an existing
task worktree
- cover branch-conflict reclaim with a regression assertion for the
branch, worktree, and provenance tuple
## Test plan
- `pnpm --filter @fusion/engine exec vitest run
src/__tests__/executor-worktree.test.ts --silent=passed-only
--reporter=dot`
- `pnpm --filter @fusion/engine typecheck`
- `pnpm check:changesets -- --strict`
- `pnpm check:fnxc-future-dates`
- `pnpm build`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Improved recovery when reclaiming existing task worktrees.
* Preserved task branch details and worktree paths during
branch-conflict recovery.
* Recorded whether branch updates originated from the system or an
operator for more reliable task state tracking.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: gsxdsm <gsxdsm@users.noreply.github.com>
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