Add QA evidence drilldown

docs/CODEX_EXECUTION_LOG.md

@@ -3373,3 +3373,32 @@ Limitations:
 
 Next recommended pass:
 - After deploy and live validation, continue with QA/QC drilldown and map evidence layers.
+
+## Sprint 94 QA/QC evidence drilldown (2026-06-22)
+
+Changed:
+- Added selected-check drilldown state to `frontend/src/components/quality/QualityResultsPanel.tsx`.
+- Added a `QA/QC evidence drilldown` surface with selected check, candidate/reference layer, analysis run, job, status, score and timestamp provenance.
+- Added false-positive evidence, false-negative evidence and map evidence handoff cards using persisted metric rows and dataset names.
+- Added parameter and findings JSON panes for persisted QA/QC provenance.
+- Added `Inspect latest check` and per-result `Inspect check` controls.
+- Added responsive QA drilldown styles to `frontend/src/styles/app.css`.
+- Added `backend/tests/test_sprint94_quality_drilldown.py`.
+- Updated `CHANGELOG.md`, `docs/TODO.md` and `frontend/README.md`.
+
+Tested:
+- Red step: `python -m pytest backend\tests\test_sprint94_quality_drilldown.py -q` failed on missing drilldown state/surfaces/styles.
+- `python -m pytest backend\tests\test_sprint94_quality_drilldown.py backend\tests\test_sprint70_quality_handoff_polish.py backend\tests\test_sprint71_quality_metric_polish.py backend\tests\test_sprint73_quality_result_filtering.py backend\tests\test_sprint86_quality_workspace_density.py -q` (`15 passed`)
+- `cd frontend && npm run typecheck`
+- `cd frontend && npm run build`
+- `bash scripts/run_readiness_check.sh` (`314 passed`; frontend typecheck/build passed; Alembic head `202606120900`; live smoke syntax passed)
+
+Open:
+- Tower deploy and live browser validation still pending for this pass.
+
+Limitations:
+- QA/QC frontend drilldown only; no API contract, persistence, migration, provider fetching or AI/model behavior changes.
+- Map evidence handoff points reviewers to candidate/reference datasets already persisted in the workbench; it does not create a new matched/unmatched geometry export.
+
+Next recommended pass:
+- After deploy and live validation, continue with QA map overlay affordances or raster pipeline hardening.

docs/TODO.md

@@ -365,3 +365,4 @@ This file now starts with the current implementation status. Older preparation/b
 - [x] Audit populated demo workflow and tighten complete-state Overview guidance copy.
 - [x] Make Overview workflow rail Map/Export clicks preserve useful dataset context.
 - [x] Add latest handoff artifact cards to the Export Center for report, metadata and GeoJSON outputs.
+- [x] Add QA/QC evidence drilldown for selected checks, false-positive/negative evidence and provenance JSON.