- ml_training_service: health check now validates orchestrator readiness
via AtomicBool flag instead of always returning "healthy"
- broker_gateway_service: replace hardcoded $100k account data with
explicit FAILED_PRECONDITION errors for unimplemented broker queries
- data_acquisition_service: spawn background download task instead of
leaving jobs stuck in Pending, add real health check with job counts
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>