storkit: create 364_bug_worktree_cleanup_loops_on_orphaned_directories

.storkit/work/1_backlog/364_bug_worktree_cleanup_loops_on_orphaned_directories.md

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+---
+name: "Worktree cleanup loops on orphaned directories"
+---
+
+# Bug 364: Worktree cleanup loops on orphaned directories
+
+## Description
+
+When a git worktree becomes orphaned (directory exists but git no longer recognises it as a valid worktree), the periodic worktree cleanup retries `git worktree remove` every minute and fails repeatedly with "fatal: not a working tree". This spams the logs indefinitely.
+
+## How to Reproduce
+
+1. Have a worktree created via storkit (e.g. for spike 329 or story 359)
+2. The worktree becomes orphaned — git refs break but the directory remains
+3. Observe server logs repeating the "not a working tree" warning every minute
+
+## Actual Result
+
+Cleanup loops forever, logging "fatal: '/workspace/.storkit/worktrees/...' is not a working tree" every minute without resolving the issue.
+
+## Expected Result
+
+If `git worktree remove` fails because git doesn't recognise the directory as a worktree, fall back to removing the orphaned directory directly (rm -rf) and clean up any stale git worktree metadata.
+
+## Acceptance Criteria
+
+- [ ] Orphaned worktree directories (exist on disk but not in git worktree list) are detected and removed
+- [ ] Removal fallback uses rm -rf when git worktree remove fails with 'not a working tree'
+- [ ] Stale .git/worktrees entries are pruned (git worktree prune)
+- [ ] No repeated log spam for the same orphaned worktree