Expand failed regional building contexts

docs/BELGIUM_BUILDING_TRAINING_LOOP.md

@@ -67,6 +67,15 @@ contexts. Its remaining known gaps are:
 
 The active production model remains unchanged while any gate fails.
 
+The v31 expansion adds eighteen independent train-only AOIs after the v30
+rotated-holdout calibration isolated the remaining domain gaps. Nine Flemish
+AOIs cover industrial roofs, ribbon development and coastal urban fabric. Nine
+Walloon AOIs add dense urban, rural-town, regional-architecture and difficult
+industrial/rail/quarry negatives. Existing validation, calibration, test and
+background-test AOIs remain frozen. The provisioner can load a short-lived
+operator session from a mode-0600 token file, allowing governed acquisition on
+an authenticated runtime without exposing credentials in process arguments.
+
 ## Reproducible evidence
 
 - corpus assembler: `scripts/assemble_belgium_building_corpus.py`;

docs/CODEX_EXECUTION_LOG.md

@@ -6,6 +6,11 @@
   per-AOI calibration evidence. Protected calibration, test, background-test
   and validation tiles remain excluded; manifests now record targeted contexts
   and their stronger repeat factors for reproducible follow-up iterations.
+- Prepared the next immutable corpus expansion with eighteen spatially
+  independent train-only AOIs: nine Flemish industrial/ribbon/coastal samples
+  and nine Walloon dense/rural/architecture or difficult-negative samples.
+  Added mode-0600 session-token-file support to the official provisioner so
+  authenticated Tower acquisition does not expose session material in argv.
 
 ## 2026-07-27 - Guest demo and product professionalization