- Add RunnerHealthCheckSettings with CPU load threshold (MaxCPULoadPercent)
- Add CPUInfo struct to runner capabilities
- Add RunnerCleanupRequest model for tracking cleanup requests
- Add GetPendingCleanupRequest for FetchTask cleanup signaling
- Server FetchTask now sets RequestCleanup flag when cleanup is needed
- Add health monitoring background service with email alerts
- Skip unhealthy runners (low disk, high CPU, high latency) during job assignment
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