Python: Simplify Python Poe tasks and unify package selectors (#4722)

* updated automation tasks and commands, with alias for the time being

* Restore aggregate test exclusions

Preserve the legacy all-tests scope for test --all by excluding lab and devui from the default aggregate sweep, while still allowing explicit package selection. Also ignore hidden/generated test directories such as .mypy_cache during aggregate discovery.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* updated versions in pre-commit

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/samples/02-agents/chat_client/chat_response_cancellation.py

@@ -29,7 +29,9 @@ async def main() -> None:
     client = OpenAIChatClient()
 
     try:
-        task = asyncio.create_task(client.get_response(messages=[Message(role="user", text="Tell me a fantasy story.")]))
+        task = asyncio.create_task(
+            client.get_response(messages=[Message(role="user", text="Tell me a fantasy story.")])
+        )
         await asyncio.sleep(1)
         task.cancel()
         await task

python/samples/02-agents/chat_client/custom_chat_client.py

@@ -94,9 +94,7 @@ class EchoingChatClient(BaseChatClient[OptionsT]):
             response_text = f"{response_text} {suffix}"
         stream_delay_seconds = float(options.get("stream_delay_seconds", 0.05))
 
-        response_message = Message(
-            role="assistant", contents=[Content.from_text(response_text)]
-        )
+        response_message = Message(role="assistant", text=response_text)
 
         response = ChatResponse(
             messages=[response_message],