Summary

• fix google ADK activity tool dispatch to use Temporal's supported execute_activity call shapes for zero, one, and multiple arguments
• add ADK integration coverage for complex tool inputs including multiple arguments, a compound map, and a bound activity method
• keep the complex-input helpers grouped with the new ADK test for readability

Testing

• poe test -q tests/contrib/google_adk_agents/test_google_adk_agents.py -k test_activity_tool_supports_complex_inputs_via_adk --timeout=5