feat: label AI-generated conversation messages

tests/openrouter-client.test.ts

@@ -574,7 +574,7 @@ describe('OpenRouterClient', () => {
           boundaries: [],
           askedForMedia: false,
           topics: [],
-          automation: { turnsUsed: 0, status: 'active', lastIncomingKey: null, handoffReason: null },
+          automation: { turnsUsed: 0, status: 'active', lastIncomingKey: null, handoffReason: null, aiMessageFingerprints: [] },
         },
         { kind: 'answer-question', reason: 'their latest message asks a direct question' },
       );