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
+        }
+    }
+}

AIClient/Assets/HotUpdate/Shaders/EnemyCombatParticle.shader.meta

@@ -0,0 +1,9 @@
+fileFormatVersion: 2
+guid: 2a89d799ffea50e4ab98f202a1e2433f
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

AIClient/Assets/HotUpdate/Shaders/HomeExplorerCutout.shader

@@ -0,0 +1,35 @@
+Shader "AIGame/HomeExplorerCutout"
+{
+    Properties
+    {
+        _MainTex ("Tex", 2D) = "white" {}
+        _Key ("Key", Color) = (0.07, 0.02, 0.09, 1)
+    }
+    SubShader
+    {
+        Tags { "Queue"="Transparent" "RenderType"="Transparent" "IgnoreProjector"="True" }
+        Blend SrcAlpha OneMinusSrcAlpha
+        ZWrite Off
+        Cull Off
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+            sampler2D _MainTex;
+            float4 _Key;
+            struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
+            struct v2f { float4 vertex : SV_POSITION; float2 uv : TEXCOORD0; };
+            v2f vert(appdata v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); o.uv = v.uv; return o; }
+            fixed4 frag(v2f i) : SV_Target
+            {
+                fixed4 c = tex2D(_MainTex, i.uv);
+                if (distance(c.rgb, _Key.rgb) < 0.12) discard;
+                c.a = 1;
+                return c;
+            }
+            ENDCG
+        }
+    }
+}

AIClient/Assets/HotUpdate/Shaders/HomeExplorerCutout.shader.meta

@@ -0,0 +1,9 @@
+fileFormatVersion: 2
+guid: a10b9d049369c454da52258d8d8ba24f
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: