fix(hero): lift the colonnade into the photographed 50-60% band

Measured from the built mesh, the colonnade (columns + capitals) was 6.90 m of the
14.50 m elevation = 47.6 %: the entablature (3.40 m) and parapet (2.20 m) were
using 5.60 m of the height. Thinned both to 3.00 m and 1.80 m in
hero_facade_build.py, which lifts the colonnade to 7.70 m = 53.1 % - inside the
50-60 % band - with the envelope, motto band and medallions unchanged relative to
the parapet.

Hero rebuilt, re-imported (bounds 2604 x 1257 x 1450 cm), DemoMap rebuilt and the
screenshot set re-rendered for review. Hero part report updated (columns 7.45 ->
8.25 m, entablature 3.40 -> 3.00 m).

TODO: colonnade item closed. MEMORY records the FBX-vs-blend --out gotcha.

Art/blender/hero/hero-facade-2026-11-07.json

@@ -33,7 +33,7 @@
       "dims_m": [
         0.95,
         0.95,
-        7.45
+        8.25
       ],
       "evidence": "6 columns at 4.96 m centres (sibling notes x measured frontage)"
     },
@@ -60,7 +60,7 @@
       "dims_m": [
         25.75,
         1.5,
-        3.4
+        3.0
       ],
       "evidence": "assumption: entablature depth"
     },
@@ -69,7 +69,7 @@
       "dims_m": [
         25.75,
         1.2,
-        2.2
+        1.8
       ],
       "evidence": "assumption: parapet carries the motto band"
     },