Add formal enemies, remaining formal partners and synthesized UI SFX

- UI SFX v3: procedurally synthesized one-shots (Tools/synth_ui_sfx.py) wired to
  buttons, rewards, errors and red dots via UiSfx, gated by the SFX setting.
- Five formal enemies (Hornlet, Dashlet, Shellhorn, HornCaptain, GreatHorn):
  Hunyuan 50k -> 2000-tri XPbr, DGXA TokenRig, Idle/Walk/Attack, nested per type
  in PrototypeArena; PrototypeBattle.Enemy gains presentation-only Moving/Strikes.
- Formal partners for all ten pets in the arena and portraits, including new
  VineSprite, ThunderLeopard and TideWhale.
- Pipeline fixes: reject local TokenRig fallback, drop loose mesh islands,
  configurable Unity run_script timeout, companion static stage.
- Also includes concurrent work from another tool in this working tree
  (FlameLion, enemy combat FX, challenge mode, home explorer, server updates).
- Resources registered in Doc/ResDesc_*.md; verified on isolated :18081.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Tools/audit_budbud_bounds.py

@@ -0,0 +1,9 @@
+import bpy,sys
+from pathlib import Path
+for fp in [Path('AIClient/Assets/Bundles/Characters/Animal/BudBud/BudBud.fbx'),Path('Tools/output/companions/BudBud/BudBud_Rigged.fbx')]:
+ bpy.ops.wm.read_factory_settings(use_empty=True); bpy.ops.import_scene.fbx(filepath=str(fp))
+ vs=[]
+ for o in bpy.context.scene.objects:
+  if o.type=='MESH': vs.extend([o.matrix_world@v.co for v in o.data.vertices])
+ mn=[min(v[i] for v in vs) for i in range(3)]; mx=[max(v[i] for v in vs) for i in range(3)]
+ print(fp.name,'min',*[round(x,5) for x in mn],'max',*[round(x,5) for x in mx],'height',round(mx[1]-mn[1],5),'center_xz',round((mn[0]+mx[0])/2,5),round((mn[2]+mx[2])/2,5))