feat: improve task execution, verification and packaging

Add execution incidents, action bursts and shared Flash history.

Expose verification and Explorer settings with streamed check results.

Support graceful cancellation, recording recovery and bundled UI resources.

Add CI quality checks and clean up comments and documentation.

tests/unit/data_engine/test_engine.py

@@ -380,7 +380,6 @@ def test_update_step_summary_includes_step_number_in_sse(tmp_path):
     assert last_update["step_number"] == 1
 
 
-
 def _foreground_engine(tmp_path):
     mock_ctx = MagicMock(spec=ArtemisContext)
     mock_execution_setup = MagicMock()