Translate Opportunist, Aggressive and Risky trainer AI

Add the AI_Opportunist, AI_Aggressive and AI_Risky scoring layers with
the ROM's stall, reckless and risky tables, HP thresholds, last-wins
ties and strict knockout test. AIDamageCalc is ported as a
pre-variation damage estimate, including a critical-hit flag left over
from an earlier move, which the original also reads. Smart remains the
only refused layer, so the rival stays gated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/trainer-battle.test.ts

@@ -8,6 +8,7 @@ import {
   type BattleInput,
   type BattleOptions,
 } from "../src/game/battle/battle";
+import { C } from "../src/game/battle/constants";
 import { generatePartyMon } from "../src/game/party/pokemon";
 import { defaultTextContext } from "../src/game/scripts/text";
 
@@ -119,6 +120,40 @@ describe.skipIf(!existsSync(romPath))("single-Pokémon trainer battles", () => {
     run.next({ action: "fight", move: 0 });
     expect(battle.enemy.curMove).toBe(165);
   });
+  it("uses the native damage estimate for Aggressive move scoring", () => {
+    const { options } = setup();
+    const enemy = options.trainer!.party[0];
+    enemy.moves = [33, 98, 0, 0]; // Tackle, Quick Attack
+    enemy.pp = enemy.moves.map((move) => move ? assets.pokemon.move(move).pp : 0);
+    options.trainer!.aiFlags = 1 << 6;
+    const battle = new Battle(options), run = battle.run();
+    for (let guard = 0; guard < 20; guard++) {
+      const next = run.next();
+      if (!next.done && next.value.kind === "action") break;
+    }
+    expect(battle.enemy.curMove).toBe(98);
+  });
+  it("lets a leftover critical-hit flag alter the AI damage estimate", () => {
+    const { options } = setup();
+    const battle = new Battle(options), run = battle.run();
+    for (let guard = 0; guard < 20; guard++) {
+      const next = run.next();
+      if (!next.done && next.value.kind === "action") break;
+    }
+    const internals = battle as unknown as {
+      criticalHit: number;
+      enemyAIDamage(move: number): number;
+    };
+    const plain = internals.enemyAIDamage(33); // Tackle
+    battle.player.screens = 1 << C.SCREENS_REFLECT;
+    const screened = internals.enemyAIDamage(33);
+    // CheckDamageStatsCritical: equal stages select unboosted stats, which
+    // ignore Reflect; DamageCalc then doubles the estimate.
+    internals.criticalHit = 1;
+    const critical = internals.enemyAIDamage(33);
+    // Rattata L4 (Atk 10) Tackle into Cyndaquil (Def 18, 36 under Reflect).
+    expect([plain, screened, critical]).toEqual([4, 3, 6]);
+  });
   it("loses without receiving prize money", () => {
     const { mon, options } = setup(2);
     mon.hp = 1;