fix: bypass Protobuf Gencode/Runtime version check in antigravity integration

Set TEMPORARILY_DISABLE_PROTOBUF_VERSION_CHECK environment variable before loading google.antigravity to prevent version errors when installed alongside google-cloud-aiplatform (which caps protobuf at <7.0.0).

Co-authored-by: Shangjie Chen <deanchen@google.com>
PiperOrigin-RevId: 953000596

Author: DeanChensj

src/google/adk/labs/antigravity/__init__.py

@@ -12,17 +12,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
+
+os.environ.setdefault("TEMPORARILY_DISABLE_PROTOBUF_VERSION_CHECK", "true")
+
 try:
   import google.antigravity  # noqa: F401
 except ImportError as e:
   raise ImportError(
       "The 'google-antigravity' package is required to use the ADK"
-      ' Antigravity integration. Install it with: pip install'
+      " Antigravity integration. Install it with: pip install"
       ' "google-adk[antigravity]"'
   ) from e
 
 from ._antigravity_agent import AntigravityAgent
 
 __all__ = [
-    'AntigravityAgent',
+    "AntigravityAgent",
 ]