fix(assets): lookbook findings — 44 missing extracted albedos, manifest nesting, lookbook tool (T-1089)

The lookbook render pass load-checked all 264 garment GLBs and found four
garments (boots, cargo pants, jeans, tank top) shipped WITHOUT their
per-body Godot-extracted albedo textures — 44 GLBs would fail to load after
a clean import. Textures regenerated via forced reimport and committed.
Also: swimsuit_onepiece manifest entry was double-nested (lead's merge bug —
runtime unaffected, reads coverage.json); flattened. The parameterized
lookbook_scene tool (drives the production compositor, auto-framing, job
list) is committed for future catalogue renders. Grey head-template finding
filed as T-1095. Lookbook itself delivered to the desktop, not committed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/assets/characters/manifest.json

@@ -204,22 +204,20 @@
       "logo_capable": false
     },
     "swimsuit_onepiece": {
-      "swimsuit_onepiece": {
-        "slot": "full_body",
-        "style": "modern",
-        "logo_capable": false,
-        "regions": {
-          "R": "straps_trim",
-          "G": "body",
-          "B": "side_blocks"
-        },
-        "default_tints": [
-          "#f2f0e8",
-          "#e34a33",
-          "#1f7a8c",
-          "#ffffff"
-        ]
-      }
+      "slot": "full_body",
+      "style": "modern",
+      "logo_capable": false,
+      "regions": {
+        "R": "straps_trim",
+        "G": "body",
+        "B": "side_blocks"
+      },
+      "default_tints": [
+        "#f2f0e8",
+        "#e34a33",
+        "#1f7a8c",
+        "#ffffff"
+      ]
     },
     "sneakers_modern": {
       "slot": "feet",