Record the imagery evidence model

MEMORY.md

@@ -4,6 +4,14 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
 
 ## Decisions
 
+- **Imagery evidence model (2026-11-03):** `TODO.md` now separates three image sources that must
+  not be mixed: licensed real-location photos (evidence of what a place looks like), generated
+  concept boards (art-direction proposals with model/prompt/spend provenance), and build captures
+  (proof the build matches). Per-venue boards go under `docs/screens/refs/<venue|block>/` with a
+  sidecar template (URL, author, licence, date, purpose, shipped vs development-only); generated
+  images stay out of `assets/` until picked, cropped, credited and audited. Every workstream now
+  ends with a capture step that updates `README.md` plus the matching docs page, verified with
+  `tools/check_screenshots.sh` and `python3 tools/check_docs.py`.
 - **Collider coverage gate (2026-11-03):** `WorldBuilder` sets `library_prop` metadata on every
   node in `library_nodes`, and `NON_BLOCKING_LIBRARY` (`marquee`, `wall_lantern`, `handrail`,
   `double_door`) documents the mounted/decorative pieces that intentionally publish no