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/synth_v3.json

@@ -0,0 +1,68 @@
+{
+  "batchId": "ui_sfx_v3",
+  "method": "procedural synthesis (Tools/synth_ui_sfx.py, numpy)",
+  "format": "44.1 kHz 16-bit stereo (dual mono)",
+  "generatedUtc": "2026-10-21T01:20:43Z",
+  "items": [
+    {
+      "id": "Ui_Click",
+      "recipe": "bubble pop 700→1250 Hz + noise tick",
+      "peakDb": -6,
+      "lengthSec": 0.08
+    },
+    {
+      "id": "Ui_Confirm",
+      "recipe": "marimba E6→B6 rising, glockenspiel on top note",
+      "peakDb": -5,
+      "lengthSec": 0.36
+    },
+    {
+      "id": "Ui_Back",
+      "recipe": "soft marimba G6→D6 falling",
+      "peakDb": -7,
+      "lengthSec": 0.22
+    },
+    {
+      "id": "Ui_Open",
+      "recipe": "rising fwip 520→1400 Hz into an E7 ping",
+      "peakDb": -7,
+      "lengthSec": 0.34
+    },
+    {
+      "id": "Ui_Close",
+      "recipe": "falling fwip 1300→480 Hz into a soft G5 tok",
+      "peakDb": -7,
+      "lengthSec": 0.24
+    },
+    {
+      "id": "Ui_Tab",
+      "recipe": "light marimba A6 tick",
+      "peakDb": -8,
+      "lengthSec": 0.07
+    },
+    {
+      "id": "Ui_Toggle",
+      "recipe": "double pop 900→1500 then 1200→1900 Hz",
+      "peakDb": -8,
+      "lengthSec": 0.1
+    },
+    {
+      "id": "Ui_Claim",
+      "recipe": "glockenspiel arpeggio C6-E6-G6-C7 with marimba body and high sparkles",
+      "peakDb": -3,
+      "lengthSec": 0.78
+    },
+    {
+      "id": "Ui_Deny",
+      "recipe": "two soft low boops 330→262 Hz, gentle not harsh",
+      "peakDb": -7,
+      "lengthSec": 0.27
+    },
+    {
+      "id": "Ui_Notify",
+      "recipe": "bell ding-ding G6 then D7",
+      "peakDb": -6,
+      "lengthSec": 0.52
+    }
+  ]
+}