[lane D] Skin the yeast: the first Trellis mesh in GUTS, through the freshly-wired GLB loader

spore_pod (the Candida foe) now renders a real 3D mesh instead of an icosahedron:
  flux_local "budding yeast colony clump, fused knobbly spheres" -> bg_remove -> trellis_mac
  -> Blender decimate 197k->3019 tris + strip materials (entities are flat emissive, only the
  silhouette matters) -> web/assets/models/spore_pod.glb (213KB, texture-free).

First real GLB through the loader wired in 0ac11ae: verified in-engine — loaded, merged,
normalized to a unit bounding sphere (r=1.0000), 6056 verts, scaled to the archetype radius,
rendering emissive amber. assets.get('models','spore_pod').geometry lights up the hook.

flora stays a procedural CapsuleGeometry on purpose: its concept IS a smooth rod, so a
5.7k-tri capsule GLB would be pure download for zero visual gain. The pipeline is for shapes
a primitive can't fake — which is exactly the yeast cluster.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/assets/manifest.json

@@ -60,7 +60,9 @@
       "url": "gen/matcap_tissue_wet.webp"
     }
   },
-  "models": {},
+  "models": {
+    "spore_pod": { "url": "models/spore_pod.glb", "tris": 3019 }
+  },
   "textures": {
     "wall_colon_a": {
       "normal": "gen/wall_colon_a_n.webp",