fix(assets): T-1090 — five fork bodies rebuilt; mesh+armature scale baked together

Root cause was double: (1) segment_body's apply_scale scaled fork MESH
vertices but not each segment's embedded armature — the shared-skeleton
compositor relocates segments by bone name, so internally-inconsistent
segments exploded (child worst at 0.72x: head bone 0.35m above its mesh —
detached heads, spider arms); (2) thin/heavy were stale high-poly artifacts
from an older segmentation, missing seg_hips. Fix: apply_fork_scale bakes
mesh AND embedded armature via transform_apply (edit-bone poking shears
chains — first attempt proved it); new blender_rebuild_forks.py rebuilds
exactly the five from the owned UBC Source exports. All five now 19 low-poly
segments matching the healthy six.

QA on the real compositor (idle+walk, front+side): 5/5 coherent; healthy
controls unchanged. Q-060 answered at the extremes: 15/15 peasant-garment
Surface Deform binds on the forks, zero shrinkwrap fallbacks, no
bust-through — the 6-of-11 placeholder debt is paid (fork garment variants
included). Follow-up filed: T-1094 (child/teen composite at adult height —
pre-existing shared-skeleton normalization, not a regression).

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

client/assets/characters/bodies/thin_f/README.md

@@ -1,13 +1,19 @@
-# Fork body type — auto-generated from mesh scaling
+# Fork body type — auto-generated from mesh + armature scaling (T-1090)
 
-This directory contains **thin_f** body segments, generated by applying
-a proportional mesh scale to the source body (Regular_Female_FullBody.gltf):
+This directory contains **thin_f** body segments, generated by applying a
+proportional scale to the source body (Regular_Female_FullBody.gltf) mesh AND its armature rest pose
+together, then segmenting:
 
   Scale: (0.82, 1.00, 0.88)
 
-These segments are APPROXIMATE. They produce a visually distinct silhouette
-but are not artist-authored from scratch. Review the proportions and refine
-the base mesh manually if the auto-scale result is not satisfactory.
+The scale is applied to the mesh vertices and the embedded armature rest pose
+with the SAME affine (T-1090 fix). This keeps each segment internally consistent
+with its own skeleton, which the shared-skeleton compositor
+(character_visual.gd) requires — a mesh-only scale detaches the head and
+explodes the limbs on relocation.
 
-Status: auto-generated, needs artist review
-Sprint 28 — visual team
+Cross-sectional differentiation (thin = narrow, heavy = wide) survives the
+composite; global height normalises to the shared skeleton (see T-1090 report /
+Q-060 for the shared-skeleton scale-normalisation note).
+
+Status: auto-generated (rebuilt T-1090), 18 segments incl. seg_hips