[codex] Ignore pending PR review comments (#27080)

## Why

The PR babysitter could surface inline comments from a GitHub review
that was still in the `PENDING` state. That allowed Codex to start
acting on feedback before the reviewer submitted it.

## What changed

- Correlate inline comments with their parent review and ignore pending
reviews and their comments.
- Remove pending review IDs from saved watcher state so the feedback
surfaces normally after publication.
- Update the skill instructions and add regression coverage for the
draft-to-published transition.

## Validation

- `python3 -m pytest
.codex/skills/babysit-pr/scripts/test_gh_pr_watch.py`
- Skill package validation with `quick_validate.py`
- Live verification on #26835: the draft comment stayed hidden and
surfaced after the review was submitted.

.codex/skills/babysit-pr/references/github-api-notes.md

@@ -44,6 +44,9 @@ Reruns only failed jobs (and dependencies) for a workflow run.
 - Review submissions:
   - `gh api repos/{owner}/{repo}/pulls/<pr_number>/reviews?per_page=100`
 
+Use each inline comment's `pull_request_review_id` to find its parent review. Ignore parent reviews
+whose `state` is `PENDING`, along with their inline comments, until the review is submitted.
+
 ## JSON fields consumed by the watcher
 
 ### `gh pr view`