This release improves configuration integrity and enhances system diagnostics for critical workflows. Endpoint URL validation is now stricter to prevent common deployment errors, and health checks provide more detailed failure information for faster troubleshooting.

### Improvements

*   Strengthened endpoint validation to enforce a `hostname` or `host:port` format, rejecting URLs with path or query components. Health check probes now return a `502 Bad Gateway` with an XML body on failure for improved diagnostic detail. (#137)
    *   **Operational Impact**: Endpoint configurations must be updated to use the simplified URL format. Monitoring systems may require updates to correctly parse `502` errors with XML bodies from readiness and liveness probes.