Health service contract for registering and checking health indicators.
Resolved via CAPABILITIES.HEALTH ('health').
registerIndicator(name: string,indicator: HealthIndicatorFn): void
Registers a health indicator.
check(): Promise<HealthReport>
Runs all registered indicators and returns the aggregated report.
checkLive(): Promise<HealthReport>
Runs only the liveness indicator (the built-in "self" indicator).
checkReady(): Promise<HealthReport>
Runs all contributed indicators for readiness.