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. Do not patch random flaky tests, CI infrastructure, dependency outages, runner issues, or other failures that are unrelated to the branch. 6. If `process_review_comment` is presen