- ensemble/model.rs: replace silent .read().ok() with map_err+tracing::error for both models and signals RwLock in health_check
- batch_tuning_manager.rs: replace let _ = stop_tuning_job() with if let Err + tracing::warn
- orchestrator.rs: replace let _ = broadcaster.send() with if let Err + tracing::warn
- tuning_manager.rs: replace let _ = progress_tx.send() with if let Err + tracing::warn
- trial_executor.rs: replace let _ = result_tx.send() with if let Err + tracing::warn
- Use {:?} for SendError types whose inner value does not implement Display
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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