[thekaveman]

Closes #30
Closes #32
Closes #33

Changes

Runbooks

• Cloud SQL Backup Verification (docs/guides/cloud-sql-backup-verification.md) — covers verifying backups are running, listing recent backups, triggering ad-hoc backups, and PITR restore procedure
• Container Image Upgrade (docs/guides/container-image-upgrade.md) — covers updating the Dockerfile, pushing release tags, verifying deployment, rollback procedures, and pre/post-upgrade checklists (links to backup runbook)

Health Check Workflow

• Scheduled health check (.github/workflows/health-check.yml) — runs every 6 hours, queries Cloud Run URL via gcloud run services describe, checks /api/health endpoint
• Deploy post-step — health check runs after terraform-apply during deployment
• Release gating — release tag creation now requires health-check.result == 'success' (was always() which ignored health check failures)
• Manual trigger — workflow_dispatch for on-demand health checks
• Reusable — workflow_call for use in other workflows
• No hardcoded URLs — always queries gcloud for the Cloud Run service URL

Documentation

• Updated plan.md Phase 5 section with links to all deliverables
• Updated AGENTS.md with devcontainer service name

[github-actions]

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