codex runtime review-trigger loop: not started by a normal launch; its own pr.opened event cannot request a review #644

The codex runtime's review-trigger loop (cli#631 / PR #642 made it read only the agent's own feed) does not run end to end today:

• Not started by a normal launch. bin/tps.ts passes autoCommit to runCodexRuntime but not reviewTrigger; the loop starts only when that field is present (utils/codex-runtime.ts).
• The runtime's own event cannot request a review. Auto-commit publishes pr.opened with a branch name in detail; the review handler needs /pull/<number> and returns normally when it is missing, so the task loop marks the event done and advances its cursor.
• A failed review request is consumed as handled for the same reason.

Ask:

• Validate the user's review-trigger config and pass it through the launcher; a real config-file launch starts the loop.
• Emit pr.opened only after PR creation, carrying the PR URL.
• Missing PR data or a failed review request fails the handler, so the cursor retries.
• Tests with configured reviewers asserting the review-request command and payload, for a runtime-produced event and a failed request.

Found in the review of cli#642; pre-existing on main.