babysit-prlisted

# PR Babysitter ## Objective Babysit a PR persistently until one of these terminal outcomes occurs: - The PR is merged or closed. - A situation requires user help (for example CI infrastructure issues, repeated flaky failures after retry budget is exhausted, permission problems, or ambiguity that cannot be resolved safely). - Optional handoff milestone: the PR is currently green + mergeable + review-clean. Treat this as a progress state, not a watcher stop, so late-arriving review comments are still surfaced promptly while the PR remains open. Do not stop merely because a single snapshot returns `idle` while checks are still pending. ## Inputs Accept any of the following: - No PR argument: infer the PR from the current branch (`--pr auto`) - PR number - PR URL ## Core Workflow 1. When the user asks to "monitor"/"watch"/"babysit" a PR, start with the watcher's continuous mode (`--watch`) unless you are intentionally doing a one-shot diagnostic snapshot. 2. Run the watcher script to snapshot PR/review/CI state (or consume each streamed snapshot from `--watch`). 3. Inspect the `actions` list in the JSON response. 4. If `diagnose_ci_failure` is present, inspect failed run logs and classify the failure. 5. If the failure is likely caused by the current branch, patch code locally, commit, and push. 6. If `process_review_comment` is present, inspect surfaced review items and decide whether to address them. 7. If a review item is actionable and correct, patch code locally, com