- Add helpers to create/remove temporary post-merge worktrees with graceful fallback to rootDir
- Run post-merge workflow steps before worktree cleanup and pass explicit execution cwd to script and prompt modes
- Detect enabled post-merge steps before provisioning isolated worktrees to avoid unnecessary git worktree operations
- Expand merger tests to verify isolated cwd usage, fallback behavior, cleanup on failure, and no-worktree path
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