Torn-clothing wardrobe mechanic (Phase A)

- engine: wardrobe states per character (manifest wardrobe.states),
  frames@<state> variant frame-sets per move with base fallback,
  tears:true moves advance state, hp threshold forces final state
- pipeline: --torn punches jagged alpha holes into clothing textures
  (alpha-clip materials) and renders @torn variants; pack maps them
- both fighters: full torn frame-sets for all 12 moves
- special gets designed forward lunge (clip travel was backward)
- verified: demo QCF+P connects, knockdown shows torn frames

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

characters/kachujin/manifest.json

@@ -7,6 +7,13 @@
   "jump_velocity": -13.5,
   "color": "#c03a2e",
   "sprite_scale": 1.25,
+  "wardrobe": {
+    "states": [
+      "base",
+      "torn"
+    ],
+    "tear_below_hp": 0.35
+  },
   "normals": {
     "P": "jab",
     "6P": "straight",