Trigger Auto Approve Reviews

One-shot: auto-approve stale review segments. Called every ~1min by cron.

Reads project.auto_approve_timeout_s per segment and transitions any active agent_chat_review row that's older than the timeout and not cancelled. Lives under /outreach/internal/* alongside the other cluster-triggered cron endpoints because the deploy tooling already points the scheduler at this path prefix.

This is an agent_chat cycle (seconds-long) — NOT part of the outreach cycles' Prefect migration (T-733); it stays inline with the legacy lock.