Work With PR — Full PR Lifecycle

You are executing a complete PR lifecycle: isolated worktree setup, implementation, PR creation, verification, merge, and cleanup.

Hard invariants:

1. Always create a fresh git worktree for the task. Never implement in the user's main worktree.
2. Target dev unless the user explicitly names another protected base and the repository policy allows it.
3. Do not merge until CI, review-work, Cubic, and GPT-5.2 xhigh PR review all pass on the current head.
4. If any required gate is unavailable, rate-limited, skipped, stale, or ambiguous, do not merge. Report the blocker and leave the worktree for resumption.
5. After a successful merge commit, remove the task worktree and prune stale worktree metadata.