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.

MEMORY.md

@@ -400,3 +400,21 @@ Scope: facts and traps that cost time to establish. Planned work lives in [TODO.
   height error; the table is the tagged height, the mesh is storey + roof.
 - Gotcha: regenerating the blockout is safe for names, but any future change to
   the import must re-verify the 6/6 frontage export and the `element.*` mapping.
+
+## 2026-11-09 — hero colonnade proportion fixed (47.6 % → 53.1 %)
+
+- The hero's colonnade (columns 2.00–7.95 + capitals 7.95–8.90) was 6.90 m of the
+  14.50 m elevation = **47.6 %**, below the photographed 50–60 %, because the
+  entablature (3.40 m) and parapet (2.20 m) used 5.60 m of the height.
+- Thinned ENTABLATURE_H 3.40 → 3.00 and PARAPET_H 2.20 → 1.80 in
+  `Tools/hero_facade_build.py`; the colonnade grows to **7.70 m = 53.1 %** while the
+  envelope, motto band and medallions keep their relationships (all positioned
+  relative to those two constants).
+- **Gotcha (cost a bad build):** `hero_facade_build.py` takes `--out` for the
+  **FBX** and `--save-blend` for the `.blend`. Passing `--out <file>.blend` writes
+  FBX bytes over the blend and Blender then reports "File format is not supported".
+  Correct invocation: `--out /tmp/gigline/hero-facade.fbx --save-blend Art/...blend
+  --report Art/...json`.
+- Rebuilt hero → re-imported (`SM_HeroFacade`, bounds 2604 × 1257 × 1450 cm) →
+  DemoMap rebuilt → screenshots re-rendered. Note `ue_hero_facade_import.py` saves
+  the map, so `chmod u+w` the `.umap` first or the import silently does not persist.