Add runner heartbeat lease recovery and watchdog

[syifan]

Summary

• add job heartbeat tracking and lease-based stale-job recovery to the runner claim path
• add Supabase migration to store heartbeat_at and update claim_next_job to requeue stale running jobs
• update runner process to emit heartbeats while executing jobs and pass lease timeout to claim RPC
• add scheduled runner-watchdog GitHub Action to auto-restart production PM2 runner when offline
• document new heartbeat/lease environment settings

Testing

• cd runner && npm ci
• cd runner && npm test

[vercel]

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Project	Deployment	Actions	Updated (UTC)
cgra-flow-ui	Ready	Preview, Comment	Feb 26, 2026 1:30am

[github-actions]

Preview Environment Ready

Service	Status
Supabase Branch	https://rhgkbbwtfsrxowbxznji.supabase.co
Runner	Deployed via SSH (runner-80)
Docker Image	cgra-flow:pr-80

The runner is connected to this PR's Supabase branch and will process jobs using the PR-specific Docker image.

[supabase]

Updates to Preview Branch (runner-heartbeat-watchdog) ↗︎

Deployments	Status	Updated
Database	✅	Thu, 26 Feb 2026 01:30:16 UTC
Services	✅	Thu, 26 Feb 2026 01:30:16 UTC
APIs	✅	Thu, 26 Feb 2026 01:30:16 UTC

Tasks are run on every commit but only new migration files are pushed.
Close and reopen this PR if you want to apply changes from existing seed or migration files.

Tasks	Status	Updated
Configurations	✅	Thu, 26 Feb 2026 01:30:27 UTC
Migrations	✅	Thu, 26 Feb 2026 01:30:29 UTC
Seeding	✅	Thu, 26 Feb 2026 01:30:29 UTC
Edge Functions	✅	Thu, 26 Feb 2026 01:30:29 UTC

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