Add reference-anchored concept generation

docs/screens/concepts/hollywood_boulevard/README.md

@@ -10,6 +10,18 @@ game textures. The geometry mapping and source links are in
 
 ![El Capitan Entertainment Centre entrance in daylight](hollywood_boulevard_entrance_day.png)
 
+## Entrance — day, photo-anchored
+
+![El Capitan Entertainment Centre entrance in daylight, anchored on the 2009 facade photo](hollywood_boulevard_entrance_day-v2.png)
+
+Generated with `generate --reference`, anchored on the licence-cleared
+[`el-capitan-facade-day-wikimedia-2009-10-27.jpg`](../../refs/hollywood/el-capitan-facade-day-wikimedia-2009-10-27.jpg)
+board photo (CC BY 2.0); provenance in
+[`hollywood_boulevard_entrance_day-v2.refgen.json`](hollywood_boulevard_entrance_day-v2.refgen.json).
+The facade geometry (motto band, column rhythm, lattice windows, banner slots,
+blade sign) follows the photograph; the street is restaged clean for art
+direction.
+
 ## Entrance — night
 
 ![El Capitan Entertainment Centre entrance at night](hollywood_boulevard_entrance_night.png)

docs/screens/concepts/hollywood_boulevard/hollywood_boulevard_entrance_day-v2.refgen.json

@@ -0,0 +1,12 @@
+{
+  "concept": "hollywood_boulevard_entrance_day",
+  "generated": "hollywood_boulevard_entrance_day-v2.png",
+  "model": "google/gemini-2.5-flash-image",
+  "reference": {
+    "file": "docs/screens/refs/hollywood/el-capitan-facade-day-wikimedia-2009-10-27.jpg",
+    "licence": "CC BY 2.0",
+    "page": "https://commons.wikimedia.org/wiki/File:El_Capitan_Theater_frontal_fachade-The_Masonic_Temple.jpg",
+    "licence_checked": true
+  },
+  "suffix": "Use the attached reference photograph as the fixed source of geometry and composition: keep the building's proportions, column rhythm, band heights, signage placement and camera angle exactly as photographed. Only restage lighting, weather, people and surface condition where the prompt asks for it. Do not invent extra storeys, wings or ornaments that the photo does not show."
+}