Polish QA metric evidence cards

docs/CODEX_EXECUTION_LOG.md

@@ -2666,3 +2666,31 @@ Limitations:
 
 Next recommended pass:
 - Continue with QA/QC result card polish, especially making metric groups easier to scan in long-lived demo projects.
+
+## Sprint 71 QA/QC metric card polish (2026-06-19)
+
+Changed:
+- Added core metric evidence cards to QA/QC result cards for precision, recall, F1, mean IoU, false positives and false negatives.
+- Kept the raw persisted metric list visible below the promoted evidence cards.
+- Added compact metric label/value formatting in `QualityResultsPanel`.
+- Added responsive `.quality-metric-grid`, `.quality-metric-card` and `.quality-metric-card-critical` CSS.
+- Added `backend/tests/test_sprint71_quality_metric_polish.py`.
+- Updated `frontend/README.md`, `docs/TODO.md` and `CHANGELOG.md`.
+
+Tested:
+- Red step: `python -m pytest backend/tests/test_sprint71_quality_metric_polish.py -q` failed on missing metric promotion helpers, markup and styles.
+- `python -m pytest backend/tests/test_sprint71_quality_metric_polish.py backend/tests/test_sprint70_quality_handoff_polish.py backend/tests/test_sprint51_quality_export_polish.py backend/tests/test_sprint30_workbench_components.py -q` (`13 passed`)
+- `cd frontend && npm run typecheck`
+- `cd frontend && npm run build`
+- Local browser check against `http://127.0.0.1:5175` with live API proxy: QA/QC workspace rendered 12 promoted metric cards across 2 persisted quality checks, retained 2 raw metric sections, no console warnings/errors and no horizontal overflow on desktop or mobile.
+- Screenshots captured under `artifacts/sprint71-quality-metric-polish/`.
+- `bash scripts/run_readiness_check.sh` (`253 passed`)
+
+Open:
+- Redeploy Tower and verify live QA/QC metric cards after deployment.
+
+Limitations:
+- Frontend readability pass only; no QA calculation, persistence, API, migrations, provider or AI/model changes.
+
+Next recommended pass:
+- Continue with QA/QC metric/result filtering or result-card density for long-lived demo projects.

docs/TODO.md

@@ -342,3 +342,4 @@ This file now starts with the current implementation status. Older preparation/b
 - [x] Add Data catalog role-density polish for reference/candidate/source scanning.
 - [x] Add Data catalog action polish for map, metadata, export and QA affordances.
 - [x] Add QA/QC handoff polish for candidate/reference context and persisted results.
+- [x] Add QA/QC metric card polish for precision, recall, F1, IoU and error counts.