feat: hero facade blockout for 6840 Hollywood Blvd

Tools/hero_facade_build.py builds the north elevation parametrically and writes
a JSON report naming the evidence behind every part: the 25.75 m frontage and
14.5 m height are measured, the 4.96 m column bay comes from the sibling notes
and matches that frontage, the three portal flights follow the photographs (five
risers, overturning the inherited eight-step, 12 m wide claim), and the rest is
labelled assumption.

Tools/ue_hero_facade_import.py imports it with the ue_metric_v1 preset
(2604 x 1257 x 1450 cm, 1892 tris, 4 materials) and places it on the measured
building line of /Game/Hollywood/DemoMap.

Two new review shots at review-04 and review-05, both pending approval. Camera
placement cost four renders: the first two sat inside the facade body, and the
frontage faces Unreal -Y, so a camera has to stand at Y < -1450 cm, not north of
the building line in project terms.

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

@@ -0,0 +1,131 @@
+{
+  "asset": "hero-facade",
+  "frame": "project frame, metres, X east Y north Z up",
+  "bounds_m": {
+    "min": [
+      -13.02,
+      -12.5,
+      0.0
+    ],
+    "max": [
+      13.02,
+      0.07,
+      14.5
+    ],
+    "size": [
+      26.04,
+      12.57,
+      14.5
+    ]
+  },
+  "parts": [
+    {
+      "object": "Hero_Mass",
+      "dims_m": [
+        24.25,
+        12.0,
+        14.5
+      ],
+      "evidence": "measured frontage x assumption depth x measured height, inset behind the cornice"
+    },
+    {
+      "object": "Hero_Stylobate",
+      "dims_m": [
+        25.75,
+        2.4,
+        1.45
+      ],
+      "evidence": "assumption: pedestal height"
+    },
+    {
+      "object": "Hero_Column_x6",
+      "dims_m": [
+        0.95,
+        0.95,
+        9.25
+      ],
+      "evidence": "6 columns at 4.96 m centres (sibling notes x measured frontage)"
+    },
+    {
+      "object": "Hero_Entablature",
+      "dims_m": [
+        25.75,
+        1.5,
+        2.2
+      ],
+      "evidence": "assumption: entablature depth"
+    },
+    {
+      "object": "Hero_Parapet",
+      "dims_m": [
+        25.75,
+        1.2,
+        1.6
+      ],
+      "evidence": "assumption: parapet carries the motto band"
+    },
+    {
+      "object": "Hero_MottoBand",
+      "dims_m": [
+        22.75,
+        0.08,
+        0.85
+      ],
+      "evidence": "photographs: motto panel above the colonnade"
+    },
+    {
+      "object": "Hero_Medallion_x2",
+      "dims_m": [
+        1.1,
+        1.1,
+        0.02
+      ],
+      "evidence": "photographs: two stone discs beside the motto"
+    },
+    {
+      "object": "Hero_PortalFlight_1",
+      "dims_m": [
+        3.1,
+        1.7,
+        1.25
+      ],
+      "evidence": "5 steps at 0.15 m rise / 0.34 m tread (assumption; photos show 4-5, the old notes said 8)"
+    },
+    {
+      "object": "Hero_PortalFlight_2",
+      "dims_m": [
+        3.1,
+        1.7,
+        1.25
+      ],
+      "evidence": "5 steps at 0.15 m rise / 0.34 m tread (assumption; photos show 4-5, the old notes said 8)"
+    },
+    {
+      "object": "Hero_PortalFlight_3",
+      "dims_m": [
+        3.1,
+        1.7,
+        1.25
+      ],
+      "evidence": "5 steps at 0.15 m rise / 0.34 m tread (assumption; photos show 4-5, the old notes said 8)"
+    },
+    {
+      "object": "Hero_Banner_x3",
+      "dims_m": [
+        1.55,
+        0.06,
+        5.4
+      ],
+      "evidence": "photographs: JIMMY KIMMEL LIVE banners on the column line"
+    },
+    {
+      "object": "Hero_Window_x10",
+      "dims_m": [
+        2.0,
+        0.08,
+        1.9
+      ],
+      "evidence": "photographs: window bands behind the colonnade"
+    }
+  ]
+}