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>

AIClient/Assets/HotUpdate/Shaders/EnemyCombatParticle.shader

@@ -0,0 +1,23 @@
+Shader "AIGame/EnemyCombatParticle"
+{
+    Properties { _MainTex ("Soft particle", 2D) = "white" {} }
+    SubShader
+    {
+        Tags { "Queue"="Transparent" "RenderType"="Transparent" "IgnoreProjector"="True" }
+        Pass
+        {
+            Blend SrcAlpha One
+            Cull Off ZWrite Off
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+            sampler2D _MainTex;
+            struct appdata { float4 vertex:POSITION; float2 uv:TEXCOORD0; float4 color:COLOR; };
+            struct v2f { float4 vertex:SV_POSITION; float2 uv:TEXCOORD0; float4 color:COLOR; };
+            v2f vert(appdata v) { v2f o; o.vertex=UnityObjectToClipPos(v.vertex); o.uv=v.uv; o.color=v.color; return o; }
+            half4 frag(v2f i):SV_Target { return tex2D(_MainTex,i.uv)*i.color; }
+            ENDHLSL
+        }
+    }
+}