a2a-source-edit: write agent.py

agent.py

@@ -103,6 +103,12 @@ class BrowserQuoteDocument(BaseModel):
         return cleaned[:160]
 
 
+class QuoteJudgeState(BaseModel):
+    """Durable state is stored in managed Postgres; this schema advertises that fact."""
+
+    persistence: str = "managed_postgres"
+
+
 class QuoteJudgeStudioV1(A2AAgent[QuoteJudgeStudioV1Config, PlatformUserAuth]):
     name = "quote-judge-studio-v1"
     description = (