Reject self targeting battle intents

scripts/verify-battle-save-normalization.mjs

@@ -52,6 +52,7 @@ try {
     ['too long battle log entry', { battleLog: ['x'.repeat(97)] }],
     ['invalid attackIntents', { attackIntents: [{ attackerId: 'liu-bei' }] }],
     ['unknown attack intent unit id', { attackIntents: [{ attackerId: 'liu-bei', targetId: 'ghost-unit' }] }],
+    ['self-targeting attack intent', { attackIntents: [{ attackerId: 'liu-bei', targetId: 'liu-bei' }] }],
     ['duplicate attack intent attacker id', { attackIntents: [{ attackerId: 'liu-bei', targetId: 'rebel-1' }, { attackerId: 'liu-bei', targetId: 'rebel-1' }] }],
     ['invalid units array', { units: {} }],
     ['invalid unit exp threshold', { units: patchUnit(0, { exp: 100 }) }],

src/game/state/battleSaveState.ts

@@ -210,6 +210,7 @@ function isAttackIntentArray(value: unknown, options: BattleSaveValidationOption
         isRecord(intent) &&
         typeof intent.attackerId === 'string' &&
         typeof intent.targetId === 'string' &&
+        intent.attackerId !== intent.targetId &&
         isKnownUnitId(intent.attackerId, options) &&
         isKnownUnitId(intent.targetId, options)
     )