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_review_map.py

@@ -305,7 +305,7 @@ try:
             # sidewalk at 2 m, look south with a level horizon so the parapets and
             # the cornice line read as horizontals. 68 deg covers both frontages at
             # this distance; the ends crop rather than the elevation leaning.
-            ("demo-retail-frontage", unreal.Vector(-4700, -2000, 200), unreal.Vector(-4700, 1400, 560), 68.0),
+            ("demo-retail-frontage", unreal.Vector(-4700, -2600, 210), unreal.Vector(-4700, 1400, 620), 66.0),
             # the two north-side background buildings (TCL, Tussaud's) seen from
             # the south across Hollywood Blvd. Probed world-space (2026-11-08):
             # TCL bbox X -22889..-18442, Y -9431..-1802; Tussaud's X -27071..