ORCH-001: handle regular PR comments in await_review

[linuxlewis]

Summary

• treat regular PR conversation comments as actionable review feedback when they arrive after the author's last response activity
• route successful await_review poll results through route-review.sh so commented enters handle_review while approvals still advance to merge
• add script-level coverage for comment detection baselines and runner coverage for the new review-state routing

Why

Maintainer feedback posted as normal PR conversation comments was being ignored by await_review, so tickets could sit idle unless feedback arrived as a formal review or unresolved line-comment thread.

Validation

• pnpm run lint:fix
• pnpm run typecheck
• pnpm run test

Ticket

• ORCH-001

[gemini-code-assist]

Code Review

This pull request enhances the PR review checking logic by introducing a Node.js script to identify actionable conversation comments and follow-up activity. It also adds a new route-review.sh script and updates the standard workflow to handle different review states like commented or changes_requested. Feedback was provided to simplify several shell script conditional checks by using arithmetic comparisons for better readability and idiomatic consistency.