[cschanhniem]

Summary

• add expert_composite to the multi-class triage benchmark and metrics snapshot
• record expert-composite top-20 class distribution as a top-k failure mode
• update roadmap/current metrics to state that expert ranking improves selective-vs-hemolytic ordering but leaks decoys into top-k

Verification

• uv run pytest tests/test_triage_benchmark.py tests/test_cli_triage.py tests/test_metrics_snapshot.py tests/test_expert_ranking_integration.py tests/test_docs_consistent.py -q
• uv run pytest -q
• git diff --check
• pre-push hook: .venv/bin/python -m pytest -q