Reject unknown campaign battle reports

scripts/verify-campaign-save-normalization.mjs

@@ -494,6 +494,37 @@ try {
     `Expected malformed report fields to be normalized without discarding the report: ${JSON.stringify(malformedReport)}`
   );
 
+  storage.clear();
+  storage.set(
+    campaignStorageKey,
+    JSON.stringify({
+      version: 1,
+      updatedAt: '2026-07-04T00:30:00.000Z',
+      step: 'fourth-camp',
+      firstBattleReport: {
+        battleId: 'unknown-battle-id',
+        battleTitle: 'Unknown Battle',
+        outcome: 'victory',
+        turnNumber: 4,
+        rewardGold: 120,
+        defeatedEnemies: 3,
+        totalEnemies: 5,
+        objectives: [],
+        units: [],
+        bonds: [],
+        itemRewards: [],
+        completedCampDialogues: [],
+        completedCampVisits: [],
+        createdAt: '2026-07-04T00:30:00.000Z'
+      }
+    })
+  );
+  const unknownReport = loadCampaignState();
+  assert(
+    unknownReport.step === 'fourth-camp' && unknownReport.firstBattleReport === undefined,
+    `Expected first battle report with unknown battle id to be discarded safely: ${JSON.stringify(unknownReport)}`
+  );
+
   storage.clear();
   storage.set(
     campaignStorageKey,
@@ -552,6 +583,19 @@ try {
           ],
           completedAt: '2026-07-04T01:00:00.000Z'
         },
+        'unknown-battle-key': {
+          battleId: 'unknown-battle-id',
+          battleTitle: 'Unknown Battle',
+          outcome: 'victory',
+          rewardGold: 999,
+          itemRewards: [],
+          campaignRewards: { supplies: [], equipment: [], reputation: [], recruits: [], unlocks: [] },
+          objectives: [],
+          units: [],
+          bonds: [],
+          reserveTraining: [],
+          completedAt: '2026-07-04T02:00:00.000Z'
+        },
         corrupted: 'not-a-settlement'
       }
     })