Align Redis and MinIO connect() idempotency in ConnectionAwareAdapter.

Move shared connect orchestration into the base adapter so both backends short-circuit when already healthy and only reconnect after a failed probe.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/unit/redis_adapter_test.py

@@ -99,10 +99,11 @@ def test_connect_with_injected_client_raises_on_redis_error() -> None:
         adapter.connect()
 
 
-def test_connect_closes_existing_non_injected_client(
+def test_connect_reconnects_when_existing_client_unhealthy(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     stale_client = MagicMock(spec=redis.Redis)
+    stale_client.ping.side_effect = redis.ConnectionError("connection lost")
     new_client = MagicMock(spec=redis.Redis)
     new_client.ping.return_value = True
     adapter = RedisAdapter(config=TEST_REDIS_CONFIG)
@@ -116,6 +117,24 @@ def test_connect_closes_existing_non_injected_client(
     assert adapter._client is new_client
 
 
+def test_connect_skips_reconnect_when_already_connected(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    stale_client = MagicMock(spec=redis.Redis)
+    stale_client.ping.return_value = True
+    adapter = RedisAdapter(config=TEST_REDIS_CONFIG)
+    adapter._client = stale_client
+
+    from_url = MagicMock()
+    monkeypatch.setattr("redis.Redis.from_url", from_url)
+
+    adapter.connect()
+
+    stale_client.close.assert_not_called()
+    from_url.assert_not_called()
+    assert adapter._client is stale_client
+
+
 def test_scan_keys_yields_decoded_keys() -> None:
     mock_client = MagicMock(spec=redis.Redis)
     mock_client.scan_iter.return_value = iter([b"key1", b"key2"])