feat(a2a): wire artifact delivery interceptor in fast_api A2A setup

src/google/adk/a2a/executor/config.py

@@ -41,6 +41,7 @@
 from .executor_context import ExecutorContext
 
 
+
 @dataclasses.dataclass
 class ExecuteInterceptor:
   """Interceptor for the A2aAgentExecutor."""

src/google/adk/cli/fast_api.py

@@ -587,6 +587,10 @@ async def get_agent_builder(
     from a2a.utils.constants import AGENT_CARD_WELL_KNOWN_PATH
 
     from ..a2a.executor.a2a_agent_executor import A2aAgentExecutor
+    from ..a2a.executor.config import A2aAgentExecutorConfig
+    from ..a2a.executor.interceptors.include_artifacts_in_a2a_event import (
+        include_artifacts_in_a2a_event_interceptor,
+    )
 
     # locate all a2a agent apps in the agents directory
     base_path = Path.cwd() / agents_dir
@@ -618,6 +622,9 @@ async def _get_a2a_runner_async() -> Runner:
         try:
           agent_executor = A2aAgentExecutor(
               runner=create_a2a_runner_loader(app_name),
+              config=A2aAgentExecutorConfig(
+                  execute_interceptors=[include_artifacts_in_a2a_event_interceptor],
+              ),
           )
 
           push_config_store = InMemoryPushNotificationConfigStore()