- Add POST /workers/register and POST /workers/{workerId}/heartbeat endpoints
- Start worker health checker goroutine in main.go
- Fix network policy to allow K8s API server access (includes real endpoint IPs)
- Add rdev.orchard9.ai/role: worker label to claudebox StatefulSet
This enables the embedded WorkExecutor to reach claudebox-0 for executing
builds on composable projects that don't have dedicated pods.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>