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/G3/economy_sample.json

@@ -0,0 +1,48 @@
+{
+  "config": "Config/Gameplay/greenfield.json",
+  "ignored": [
+    "natural marble recovery",
+    "pinball path variance beyond bin average"
+  ],
+  "pinballAverage": {
+    "candy": 20.0,
+    "coins": 52.0,
+    "perTenShots": {
+      "candy": 200,
+      "coins": 520,
+      "tickets": 1
+    }
+  },
+  "designDay1Balls": 67,
+  "designFormulaWithLiveNonStageSources": 67,
+  "configFirstFiveStageBalls": 17,
+  "day1": {
+    "coins": 640,
+    "candy": 370,
+    "balls": 79,
+    "tickets": 0
+  },
+  "sevenDaysWithoutClears": {
+    "coins": 0,
+    "candy": 0,
+    "balls": 205,
+    "tickets": 0
+  },
+  "stuckBefore1_5": {
+    "walletBeforePinball": {
+      "coins": 440,
+      "candy": 270,
+      "balls": 74,
+      "tickets": 0
+    },
+    "trainToLevel5Candy": 300,
+    "candyGap": 30,
+    "pinballShotsToCloseCandy": 2,
+    "evolveCoins": 500,
+    "coinGap": 60,
+    "pinballShotsToCloseCoins": 2,
+    "evolveShards": 40,
+    "shardsFromChoiceChest": 10,
+    "shardGap": 30
+  }
+}