Watch an ASC CLI pull request

Preserve the PR context and authority under AGENTS.md: status reads once; watch repeats until a terminal state; fix-and-watch also applies authorized fixes. Watching alone grants no edit, commit, push, or reply authority. A one-time check ends after reporting its snapshot; do not start a full readiness audit or heartbeat unless requested or already authorized.

Recheck current state

1. Resolve the exact PR and compare its current head SHA with the last audited or pushed SHA.
2. Fetch checks, reviews, top-level comments, and GraphQL review threads in parallel where possible. Separate required checks from advisory jobs.
3. Separate new actionable feedback from resolved, outdated, informational, duplicate, or bot-noise comments.
4. If the head changed outside this workflow, inspect the new diff before relying on prior conclusions.
5. If main advanced, refresh the merge-base diff and mergeability; follow the branch-update rules in AGENTS.md.

Address actionable feedback

Apply fixes and external writes only when authorized. Otherwise report the verified finding and proposed fix; if it prevents progress, return blocked with the exact missing authority.