Revert "feat: Upgrade A2UI examples to v0.9 schema (#751)"

This reverts commit b698146.

Author: nan-yu

.github/workflows/python_samples_build.yml

@@ -51,10 +51,6 @@ jobs:
         working-directory: samples/agent/adk
         run: uv run pyink --check .
 
-      - name: Validate Sample Examples
-        run: |
-          PYTHONPATH=agent_sdks/python/src uv run --project agent_sdks/python pytest -vv samples/agent/adk/tests/test_examples_validation.py
-
       - name: Build contact_lookup
         working-directory: samples/agent/adk/contact_lookup
         run: uv build .

samples/agent/adk/contact_lookup/agent.py

@@ -32,7 +32,7 @@
 from google.genai import types
 from prompt_builder import get_text_prompt, ROLE_DESCRIPTION, WORKFLOW_DESCRIPTION, UI_DESCRIPTION
 from tools import get_contact_info
-from a2ui.core.schema.constants import VERSION_0_9
+from a2ui.core.schema.constants import VERSION_0_8
 from a2ui.core.schema.manager import A2uiSchemaManager
 from a2ui.basic_catalog.provider import BasicCatalog
 from a2ui.a2a import get_a2ui_agent_extension
@@ -48,15 +48,11 @@ class ContactAgent:
   def __init__(self, base_url: str, use_ui: bool = False):
     self.base_url = base_url
     self.use_ui = use_ui
-    self.version = VERSION_0_9
     self._schema_manager = (
         A2uiSchemaManager(
-            version=self.version,
+            version=VERSION_0_8,
             catalogs=[
-                BasicCatalog.get_config(
-                    version=self.version,
-                    examples_path=f"examples/{self.version}",
-                )
+                BasicCatalog.get_config(version=VERSION_0_8, examples_path="examples")
             ],
         )
         if use_ui