Auto-merge PRs after CI checks pass without manual re-review

When a PR is ready, the user tells the assistant to watch/monitor CI checks and merge automatically once everything passes (e.g., 'let's go', 'watch CI and merge when everything passes', 'if all checks pass, merge it; if a job flaked, rerun it'). The assistant should proactively poll/check CI status across all required jobs (Analyze, CodeQL, Unit Tests, E2E, Secret Scan, Seer Code Review, Socket Security, etc.), and once all pass, merge the PR without waiting for further explicit approval. If a job fails or flakes (especially E2E/UI tests), rerun that specific job rather than blocking the whole merge. This applies to routine PRs (dependency bumps, small fixes) where the user has already reviewed intent and just wants CI-gated automatic merging handled end-to-end.