feat(facades): 0.1.6 retail second pass — relief, material mapping, framing

What the first pass got wrong, and what changed:

- The mural plates were placed 0.20 m INSIDE the solid blockout volume, so they
  never rendered. Nothing can be recessed into a solid we do not cut: the inset is
  now faked by a proud frame with a near-flush plate, and the row reads.
- Detail sat 0.05 m off the wall, under a pixel of depth at 40 m. Trim planes now
  stand 0.10-0.20 m proud, and the parapet became two tiers with deeper reveals.
- 6806's parapet started at 0.62 H and left a 4.6 m blank band; the window storey
  and parapet moved up to follow the photograph.
- Security bars on the upper windows, twelve fluted fins on the corner tower.
- The trim's stucco/white/glass slots are mapped onto the demo's look materials, so
  the walls sit in the same noise/texture family as the rest of the block; the
  colour slots sampled from the photograph stay as authored.
- Review camera pulled back and widened to 66 deg so the east end is in frame.
- The scene audit caught duplicate RetailTrim_ actors: the demo builder's clear list
  did not include the new label, so every rebuild stacked another copy.

Still open and not fixable by geometry: wall lettering. A plate at 0.10 m does not
read at 40 m, so it moves to the 0.9.0 decal route (TODO.md, Screenshots/README.md).

Tools/ue_build_demo_map.py

@@ -305,7 +305,8 @@ def build():
             log(f"could not create {MAP}")
             return
 
-    removed = clear(("Demo_", "PlayerStart", "Hero_Facade", "Frontage_", "ShotSequencer"))
+    removed = clear(("Demo_", "PlayerStart", "Hero_Facade", "Frontage_", "RetailTrim_",
+                     "ShotSequencer"))
     log(f"cleared {removed} previous demo actors")
 
     # --- lighting: fixed daytime ------------------------------------------
@@ -614,7 +615,19 @@ def build():
             comp = actor.static_mesh_component
             comp.set_static_mesh(mesh)
             comp.set_mobility(unreal.ComponentMobility.MOVABLE)
-            log(f"staged: {label}")
+            # Map the trim's own slots onto the look-dev materials where the surface
+            # type matches, so the walls sit in the same noise/texture family as the
+            # rest of the block. The trim's colour slots (bronze, burgundy, mural,
+            # lettering) stay as authored: those tones came from the photograph.
+            TRIM_LOOK = {"M_Retail_Stucco": "M_Stucco", "M_Retail_White": "M_Stucco",
+                         "M_Retail_Glass": "M_FacadeGlass"}
+            mapped = 0
+            for index, slot in enumerate(mesh.get_editor_property("static_materials")):
+                target = TRIM_LOOK.get(str(slot.get_editor_property("material_slot_name")))
+                if target and target in built:
+                    comp.set_material(index, built[target])
+                    mapped += 1
+            log(f"staged: {label} ({mapped} slot(s) onto look materials)")
 
     # --- player start: north sidewalk, facing the hero frontage -------------
     # Signs were measured from the imported meshes rather than assumed: the FBX