feat(accuracy): complete phase 3 data scan and quarantine

docs/CODEX_EXECUTION_LOG.md

@@ -12361,3 +12361,33 @@ Open:
   disposable environment, but Phase 2 remains **in progress** and Phase 3 is
   **not ready**. No training, protected-test release, promotion, national
   validation or production migration is authorized by this result.
+
+## 2026-08-02 - Accuracy Improvement Program Phase 3 full data scan
+
+### Implemented and verified scope
+
+- Added `scripts/run_accuracy_phase3_full_data_scan.py`, a read-only,
+  SHA-256-bound and batch-resumable scanner for the configured local GeoIntel
+  roots. It validates GeoJSON geometry/bounds, GeoTIFF readability/CRS/
+  resolution/nodata, manifests, YOLO labels and generic immutable artefacts.
+- Retained full scan, anomaly, logical quarantine, duplicate, leakage,
+  source-freshness, dataset-summary and checkpoint manifests under
+  `artifacts/evidence/accuracy/P3/`. Three known external boundaries are
+  explicitly represented as unreachable; no source file was removed or
+  overwritten.
+- Added a deterministic fixture test covering valid/invalid GeoJSON, corrupt
+  raster input, exact duplicates, quarantine and a byte-stable resumed replay.
+
+### Evidence and decision
+
+- The scan processed 295 local files and recorded 3 unreachable scope items;
+  `295 + 0 skipped + 3 unreachable = 298` reconciles exactly. Two consecutive
+  runs produced scan ID `p3-46ee3f8d3a2dc52b` and content hash
+  `1a219362c6cb2ac00489625f1a9b36e2fd4809ab58ee55ab1f67c3cc34773f3e`.
+- 172 anomalies were retained and 163 affected items were logically
+  quarantined. The P1 split inventory (24 AOI pairs below 2 km and no proven
+  split independence) remains an explicit leakage attention signal.
+- Phase 3 is **done for the bounded project environment** and Phase 4 is
+  **ready** for remediation/review. This does not unlock training, promotion,
+  national validation or production release; those gates remain governed by
+  the execution contract and the incomplete Phase 2 gates.