Unblock objective Belgian training loop

docs/CODEX_EXECUTION_LOG.md

@@ -11747,3 +11747,41 @@ Deployment evidence:
 - Repeated the live landing, guest bootstrap, map navigation and quality
   navigation against `http://192.168.10.150:1202`; the inspected live flow
   produced no browser-console errors.
+
+## 2026-07-29 - V36 assessment and objective-loop repair
+
+- Audited the current Tower evidence rather than relying on the earlier v6
+  checkpoint. The governed v30 rotated-holdout corpus contains 124 samples,
+  21,830 accepted labels, zero temporal-unknown samples, an immutable manifest
+  and no spatial leakage. Its split composition exceeds the frozen regional
+  minima and protected samples remain outside training.
+- Assessed the completed YOLO11x v36 checkpoint calibration-first on the RTX
+  4080. At the selected threshold `0.10`, aggregate F1 is `0.552`, Brussels F1
+  is `0.662`, Wallonia F1 is `0.532`, and Flanders F1 is `0.265`. The candidate
+  failed Flanders F1/precision/recall and Wallonia precision, so test and
+  background evidence were not opened and the production model was unchanged.
+- Built checksummed v37 failure-driven sampling from that rejection: 3,900
+  train entries across 94 train AOIs, with extra Flanders recall and
+  Flanders/Wallonia precision evidence. The sampling audit records zero
+  protected samples in training.
+- Started the inactive v37 YOLO11x fine-tune on Tower CUDA device 0 with
+  deterministic seed `20260806`, `max_det=1000`, AdamW and aerial rotation
+  augmentation. NVIDIA process evidence confirmed GPU execution.
+- Corrected a loop deadlock: an automatically clean corpus awaiting the final
+  human review has status `needs_human_review`, while the orchestrator formerly
+  required `ok`. Training now accepts that status only when the manifest is
+  immutable, automated failures are empty, spatial leakage is `ok`, and blank
+  positive-tile count is zero. Human sign-off remains a separate mandatory
+  final promotion gate.
+
+Verified in this pass:
+
+- `py -3 -m pytest -q backend/tests/test_belgium_training_loop.py backend/tests/test_belgium_training_iteration_assessment.py backend/tests/test_belgium_training_portfolio.py`
+  (`12 passed`).
+
+Open:
+
+- Let v37 finish, run calibration-only assessment, and expose protected test
+  and pure-background results only if every regional calibration gate passes.
+- Continue failure-driven, train-only corpus iterations until all objective
+  gates pass; only then request the queued representative human review.