fix: resolve CI test failures for Redis temp state and S3 deps

- Install s3 optional dependency in CI (--extra s3) so aioboto3 is
  available and S3 artifact tests run
- Defensively filter temp: prefixed keys in RedisSessionService.append_event
  to ensure temp state is never persisted to Redis

Author: miyannishar

.github/workflows/unit-tests.yaml

@@ -31,7 +31,7 @@ jobs:
           uv venv .venv
           source .venv/bin/activate
           # Install dependencies as recommended in CONTRIBUTING.md
-          uv sync --extra test 
+          uv sync --extra test --extra s3
 
       - name: Run unit tests with pytest
         run: |

src/google/adk_community/sessions/redis_session_service.py

@@ -197,6 +197,13 @@ async def append_event(self, session: Session, event: Event) -> Event:
         await super().append_event(session=session, event=event)
         session.last_update_time = event.timestamp
 
+        # Defensively strip temp state so it is never persisted to Redis.
+        temp_keys = [
+            k for k in session.state if k.startswith(State.TEMP_PREFIX)
+        ]
+        for k in temp_keys:
+            del session.state[k]
+
         async with self.cache.pipeline(transaction=False) as pipe:
             user_sessions_key = RedisKeys.user_sessions(
                 session.app_name, session.user_id