Remove unused type: ignore comments

- Remove unused type: ignore comments from agent_to_a2a.py lines 108-110
- These were flagged by mypy as unused-ignore when dependencies are installed
- All tests still passing (3/3 token tests)
- All linters passing (ruff, mypy)

Co-authored-by: g3force <779094+g3force@users.noreply.github.com>

Author: Copilot

adk/agenticlayer/agent_to_a2a.py

@@ -105,9 +105,9 @@ async def create_runner() -> Runner:
                 plugins=[CallbackTracerPlugin()],
             ),
             artifact_service=InMemoryArtifactService(),
-            session_service=InMemorySessionService(),  # type: ignore
-            memory_service=InMemoryMemoryService(),  # type: ignore
-            credential_service=InMemoryCredentialService(),  # type: ignore
+            session_service=InMemorySessionService(),
+            memory_service=InMemoryMemoryService(),
+            credential_service=InMemoryCredentialService(),
         )
 
     # Create A2A components