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>

Doc/Design/Sound/UiSfx/playback_assets.json

@@ -0,0 +1,83 @@
+{
+  "batch": "ui_sfx_v3",
+  "prefab": "Assets/Bundles/Sound/Prefab/UiSfx.prefab",
+  "address": "UiSfx",
+  "package": "Art",
+  "group": "Sound",
+  "volume": 0.8,
+  "sfxToggle": "PrototypeClientPrefs.Sfx",
+  "clips": [
+    {
+      "sound": "Click",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Click.wav",
+      "seconds": 0.08,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Confirm",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Confirm.wav",
+      "seconds": 0.36,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Back",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Back.wav",
+      "seconds": 0.22,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Open",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Open.wav",
+      "seconds": 0.34,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Close",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Close.wav",
+      "seconds": 0.24,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Tab",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Tab.wav",
+      "seconds": 0.07,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Claim",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Claim.wav",
+      "seconds": 0.78,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Deny",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Deny.wav",
+      "seconds": 0.27,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Toggle",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Toggle.wav",
+      "seconds": 0.1,
+      "channels": 2,
+      "frequency": 44100
+    },
+    {
+      "sound": "Notify",
+      "clip": "Assets/Bundles/Sound/SFX/UI/Ui_Notify.wav",
+      "seconds": 0.52,
+      "channels": 2,
+      "frequency": 44100
+    }
+  ],
+  "bundleBuilt": false,
+  "verifiedUtc": "2026-10-21T01:21:08.0054518Z"
+}