feat: add resonance follow-up attacks

scripts/verify-battle-save-normalization.mjs

@@ -35,6 +35,23 @@ try {
   assert(normalizeBattleSaveSlot(Number.NaN, 3) === 1, 'Expected NaN slot to normalize to slot 1.');
   assert(normalizeBattleSaveSlot(99, 3) === 3, 'Expected overflowing slot to clamp to slot count.');
   assert(isValidBattleSaveState(validState, options), 'Expected valid battle save to pass validation.');
+  const validCompletedAttackHistoryState = {
+    ...validState,
+    actedUnitIds: ['liu-bei', 'guan-yu'],
+    attackIntents: [
+      { attackerId: 'liu-bei', targetId: 'rebel-1' },
+      { attackerId: 'guan-yu', targetId: 'rebel-1' }
+    ]
+  };
+  assert(
+    isValidBattleSaveState(validCompletedAttackHistoryState, options),
+    'Expected unique completed allied attacks against a living enemy to pass validation.'
+  );
+  assert(
+    JSON.stringify(parseBattleSaveState(JSON.stringify(validCompletedAttackHistoryState), options)?.attackIntents) ===
+      JSON.stringify(validCompletedAttackHistoryState.attackIntents),
+    'Expected completed allied attack history to round-trip through battle-save parsing.'
+  );
   assert(
     ['elite', 'mobile', 'siege'].every((sortieOrderId) => isValidBattleSaveState({ ...validState, sortieOrderId }, options)),
     'Expected every sortie order id to pass battle-save validation.'
@@ -218,6 +235,7 @@ try {
     ['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' }] }],
+    ['unacted attack intent attacker', { actedUnitIds: [] }],
     ['enemy attack intent attacker', { attackIntents: [{ attackerId: 'rebel-1', targetId: 'liu-bei' }] }],
     ['ally attack intent target', { attackIntents: [{ attackerId: 'liu-bei', targetId: 'guan-yu' }] }],
     ['defeated attack intent attacker', { units: patchUnit(0, { hp: 0 }) }],