Implements Kubernetes-style liveness probes that call MCP tools defined
in server healthCheck configs. For STDIO servers, uses docker exec to
spawn a disposable MCP client that sends initialize + tool call. For
HTTP/SSE servers, sends JSON-RPC directly.
- HealthProbeRunner service with configurable interval/threshold/timeout
- execInContainer added to orchestrator interface + Docker implementation
- Instance findById now includes server relation (fixes describe showing IDs)
- Events appended to instance (last 50), healthStatus tracked as
healthy/degraded/unhealthy
- 12 unit tests covering probing, thresholds, intervals, cleanup
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
