Add recoverGhostReviewTasks as a final-fallback scan in the maintenance
loop. Catches any in-review task that fell through every more-specific
recovery scan and has been idle past taskStuckTimeoutMs, kicks it back
to todo with transient status cleared. Worktree state is intentionally
ignored — the executor recreates as needed. Preserves human-handoff and
active-merge statuses; rate-limited naturally by updatedAt refresh.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>