fix(session): skip current model event when censoring previous user message

src/va_agent/session.py

@@ -400,8 +400,8 @@ class FirestoreSessionService(BaseSessionService):
             event_data = event_to_save.model_dump(mode="json", exclude_none=True)
 
             # Also censor the previous user message in Firestore
-            # Find the last user event in the session
-            for i in range(len(session.events) - 1, -1, -1):
+            # Find the last user event in the session (skip the current model event we just added)
+            for i in range(len(session.events) - 2, -1, -1):
                 prev_event = session.events[i]
                 if (
                     prev_event.author == "user"