feat: add health watchdog, key auto-sync, analytics, Discord notifications, trivial-PR merge
- health-check.py: model health watchdog (silent when healthy, alert on 2+ consecutive failures) — catches stale-key/model-breakage like 2026-08-04 - sync-key.py: systemd ExecStartPre syncs 9router key from BWS to disk, prevents silent 401s after key rotation - run_server.py: CONFIG__ANALYTICS_FOLDER + /api/metrics (Prometheus) + /api/analytics (JSON) + /api/v1/notify_review (Discord webhook) - trivial_merge.py: trivial-PR fast-path (docs/deps/tiny diffs) approve+merge - auto_merge_bot.py: Discord notifications on merge, trivial integration - flake.nix: ship pr-agent-sync-key + pr-agent-health-check binaries
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