feat: agents can wait on pull request CI and review feedback

[flamboh]

Note

🤖 Claude Opus 5.5 on behalf of Oliver

ELI5

An agent can now say "tell me when CI finishes" and stop working. T3 Code keeps an eye on the pull request and wakes the agent back up when checks fail, finish, or a reviewer leaves feedback.

Problem

Agents waiting on CI either burn a turn polling gh or end the turn and forget. There was no durable way to resume a thread when a pull request changes.

Implementation

• watch_pull_request / cancel_pull_request_watch MCP tools register one-shot watches for check_failed, checks_finished, and review_feedback.
• Watches live in a plain service table (pull_request_watches, migrations 056-057), polled once a minute on the shared scheduler. Matches coalesce for 15s, freeze a payload, and deliver it as a server notification message with stable command/message ids so restarts never duplicate delivery.
• Pending watches appear in the thread's background-task roster, so the thread reads as waiting. Web and mobile show a waiting notice with a cancel action, gated on the new pullRequestWatches capability.
• GitHub only for now; other hosts report unsupported.

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Built with Claude Opus 5.5 in Claude Code (T3 Code).

[github-actions]

Thread transfer impact

⚠️ The latest CI run did not produce a thread transfer result for e5b97c7.

This comment will update automatically after the next completed run.