Validate sortie flow campaign routing

scripts/verify-campaign-flow-data.mjs

@@ -41,6 +41,22 @@ for (const [flowKey, nextBattleId] of sortieFlowNextBattleIds.entries()) {
   assert(battleIds.has(nextBattleId), `Sortie flow ${flowKey} references unknown next battle id: ${nextBattleId}`);
 }
 
+for (const flowKey of sortieFlowKeys) {
+  const nextBattleId = sortieFlowNextBattleIds.get(flowKey);
+  const campaignStep = sortieFlowCampaignSteps.get(flowKey);
+  if (!nextBattleId) {
+    continue;
+  }
+
+  assert(campaignStep, `Sortie flow ${flowKey} has next battle ${nextBattleId} but no campaign step`);
+  if (campaignStep) {
+    assert(
+      routedBattleSteps.get(campaignStep) === nextBattleId,
+      `Sortie flow ${flowKey} marks campaign step ${campaignStep} but routes to ${routedBattleSteps.get(campaignStep) ?? 'no battle'} instead of ${nextBattleId}`
+    );
+  }
+}
+
 for (const [battleId, unlockBattleId] of campaignRewardUnlockBattleIds.entries()) {
   const nextBattleId = sortieFlowNextBattleIds.get(battleId);
   assert(battleIds.has(unlockBattleId), `Battle ${battleId} campaign reward unlocks unknown battle id: ${unlockBattleId}`);