evaluate models on fresh regional calibration AOIs

docs/CODEX_EXECUTION_LOG.md

@@ -12771,3 +12771,29 @@ Open:
   No independent positive or background accuracy evidence currently exists for
   this model family; new AOIs must be provisioned without ancestry or spatial
   exposure before another ranking is defensible.
+
+## 2026-08-09 - Fresh V72 regional calibration
+
+### Delivered
+
+- Added custom non-protected AOI provisioning with explicit rejection of test
+  and background-test roles.
+- Acquired six new governed orthophoto/reference pairs across all three Belgian
+  regions and froze an evaluation-only, training-prohibited corpus.
+- Added a diagnostic tiler that refuses training-eligible manifests, emits no
+  training data and excludes generic overlapping edge-cover windows.
+- Added a raster-bound spatial lineage audit. All 31 ancestral AOIs resolved;
+  every V72 AOI passes the 2 km separation floor.
+- Added strict pure-background validation: non-empty labels can no longer be
+  silently counted as pure background.
+
+### GPU result and decision
+
+- Corrected view: 24 non-overlapping tiles, 348 labels, six AOIs.
+- Active mAP50/mAP50-95: `0.056779`/`0.021750`.
+- Challenger mAP50/mAP50-95: `0.044705`/`0.016004`.
+- Confidence 0.25 F1: active `0.231527`, challenger `0.235885`.
+- The active aggregate F1 peaks at 0.30, but its Flemish subgroup regresses;
+  threshold, active weights and production image therefore remain unchanged.
+- The weak fresh-domain scores are retained as a real blocker, not hidden by
+  the older exposed Turnhout/Westerlo/Postel diagnostics.