Implements automatic workspace hibernation for workspaces that have been idle
longer than their configured hibernation_idle_minutes threshold.
Changes:
- migrations/029: Add hibernation_idle_minutes INT DEFAULT NULL column +
partial index on workspaces table
- registry/hibernation.go: New StartHibernationMonitor goroutine that ticks
every 2 min and calls hibernateIdleWorkspaces via the HibernateHandler
callback (same import-cycle-prevention pattern as OfflineHandler)
- registry/hibernation_test.go: 5 unit tests covering handler calls, no-rows,
DB error, tick behaviour, and context-cancel shutdown
- handlers/workspace_restart.go: New Hibernate() HTTP handler (POST
/workspaces/:id/hibernate) + HibernateWorkspace(ctx, id) method — stops
container, sets status='hibernated', clears Redis keys, broadcasts event
- handlers/a2a_proxy.go: Auto-wake in resolveAgentURL — when status='hibernated'
and URL is empty, triggers async RestartByID and returns 503 + Retry-After: 15
so callers can retry transparently
- registry/liveness.go: Exclude 'hibernated' workspaces from offline detection
- router.go: Register POST /workspaces/:id/hibernate under wsAuth group
- cmd/server/main.go: Wire hibernation monitor via supervised.RunWithRecover
Closes#711
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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