Restrict enemy usable save keys

scripts/verify-battle-save-normalization.mjs

@@ -126,6 +126,7 @@ try {
     ['malformed enemy usable key', { enemyUsableUseKeys: ['rebel-1:shout'] }],
     ['wrong battle enemy usable key', { enemyUsableUseKeys: ['other-battle:rebel-1:roar'] }],
     ['unknown enemy usable unit id', { enemyUsableUseKeys: ['first-battle-zhuo-commandery:ghost-unit:roar'] }],
+    ['ally enemy usable unit id', { enemyUsableUseKeys: ['first-battle-zhuo-commandery:liu-bei:roar'] }],
     ['unknown enemy usable id', { enemyUsableUseKeys: ['first-battle-zhuo-commandery:rebel-1:phantom'] }],
     ['duplicate enemy usable key', { enemyUsableUseKeys: ['first-battle-zhuo-commandery:rebel-1:roar', 'first-battle-zhuo-commandery:rebel-1:roar'] }],
     ['invalid triggered events', { triggeredBattleEvents: [1] }],

src/game/state/battleSaveState.ts

@@ -555,6 +555,7 @@ function isEnemyUsableUseKey(value: unknown, battleId: string, options: BattleSa
     typeof usableId === 'string' &&
     usableId.length > 0 &&
     isKnownUnitId(unitId, options) &&
+    (!options.validEnemyUnitIds || options.validEnemyUnitIds.has(unitId)) &&
     (!options.validUsableIds || options.validUsableIds.has(usableId))
   );
 }