Get Resource Health

Get health status of a resource by provider, resource type, and name.

Proxies the health check to the provider runtime that manages this resource. The provider calls the resource’s health() method and returns the result.

Returns: ResourceHealth with status (healthy, unhealthy, degraded) and optional details.

Raises: HTTPException: 404 if health check not available, 504 on timeout, 502 on provider error.