Mark all slow tests with @pytest.mark.slow

Optimize agent drilldown by parallelizing co-worker rubric generation with main agent execution. Added integration test to verify parallel flow.

fix: stabilize integration tests and improve agent drilldown UI compatibility

test(integration): conditionally skip node docker lifecycle test in devcontainer

fix(tests): restore default user node mapping to prevent downstream skill failures

Fix file sync integration tests and session auto-purge bug

Add distinct Node Registration flow integration tests verifying token generation and DB insertion