Taper the NPC torso into the hips

TODO.md

@@ -89,8 +89,9 @@ and equipment fit.
 - [x] Improve the neck and shoulder transition so the silhouette reads as one body rather than a
       thin post on a hanger. (Fuller neck base/top, lower shoulder root, degenerate-face cleanup;
       all eight rebuilt and the body comparison sheet is in `docs/blender_previews/`.)
-- [ ] Improve the torso and hip transition; preserve the existing broad/slim/average build
-      variations.
+- [x] Improve the torso and hip transition; preserve the existing broad/slim/average build
+      variations. (Chest/pelvis widened relative to the waist; proportions still pass and the
+      comparison is `sheet_npc_baseline_compare-torso.jpg`.)
 - [ ] Add subtle body-shape variation between variants beyond uniform scaling (shoulder slope,
       torso taper, hip width, limb thickness) while staying inside the triangle/vertex budget.
 - [ ] Check the procedural fallback and `npc_base` silhouette against the library so the fallback