[BREAKING] Python: clean up kwargs across agents, chat clients, tools, and sessions (#4581)

* Python: clean up kwargs across agents, chat clients, tools, and sessions (#3642)

Audit and refactor public **kwargs usage across core agents, chat clients,
tools, sessions, and provider packages per the migration strategy codified
in CODING_STANDARD.md.

Key changes:
- Add explicit runtime buckets: function_invocation_kwargs and client_kwargs
  on RawAgent.run() and chat client get_response() layers.
- Refactor FunctionTool to prefer explicit ctx: FunctionInvocationContext
  injection; legacy **kwargs tools still work via _forward_runtime_kwargs.
- Refactor Agent.as_tool() to use direct JSON schema, always-streaming
  wrapper, approval_mode parameter, and UserInputRequiredException
  propagation (integrates PR #4568 behavior).
- Remove implicit session bleeding into FunctionInvocationContext; tools
  that need a session must receive it via function_invocation_kwargs.
- Lower chat-client layers after FunctionInvocationLayer accept only
  compatibility **kwargs (client_kwargs flattened, function_invocation_kwargs
  ignored).
- Add layered docstring composition from Raw... implementations via
  _docstrings.py helper.
- Clean up provider constructors to use explicit additional_properties.
- Deprecation warnings on legacy direct kwargs paths.
- Update samples, tests, and typing across all 23 packages.

Resolves #3642

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

* clarified docstring

* feedback fixes

* Add unit tests for _docstrings.py build/apply helpers

Tests cover: no docstring source, no extra kwargs, appending to existing
Keyword Args section, inserting after Args, inserting in plain docstrings,
multiline descriptions, ordering, and apply_layered_docstring.

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

* Add test for propagate_session TypeError on non-AgentSession values

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

* Add tests for multi-content and empty UserInputRequiredException propagation

Cover the branching logic in _try_execute_function_calls for:
- Multiple user_input_request items in a single exception (extra_user_input_contents path)
- Empty contents list (fallback function_result path)

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

* Add tests for DurableAIAgent.get_session forwarding service_session_id

Verifies get_session correctly forwards service_session_id and session_id
to the executor's get_new_session, replacing the removed kwargs test.

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

* Simplify ag-ui test stub to read session from client_kwargs only

Remove dual-mode detection (client_kwargs vs raw kwargs fallback) from
the test mock. Session is now read exclusively from client_kwargs,
matching the settled public calling convention.

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

* updated create and get sessions in durable

* fixed docstrings

* fix test

* updated session handling

* updated from main

* updated tests

---------

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

python/packages/copilotstudio/agent_framework_copilotstudio/_agent.py

@@ -196,7 +196,6 @@ class CopilotStudioAgent(BaseAgent):
         *,
         stream: Literal[False] = False,
         session: AgentSession | None = None,
-        **kwargs: Any,
     ) -> Awaitable[AgentResponse]: ...
 
     @overload
@@ -206,7 +205,6 @@ class CopilotStudioAgent(BaseAgent):
         *,
         stream: Literal[True],
         session: AgentSession | None = None,
-        **kwargs: Any,
     ) -> ResponseStream[AgentResponseUpdate, AgentResponse]: ...
 
     def run(
@@ -215,7 +213,6 @@ class CopilotStudioAgent(BaseAgent):
         *,
         stream: bool = False,
         session: AgentSession | None = None,
-        **kwargs: Any,
     ) -> Awaitable[AgentResponse] | ResponseStream[AgentResponseUpdate, AgentResponse]:
         """Get a response from the agent.
 
@@ -229,22 +226,20 @@ class CopilotStudioAgent(BaseAgent):
         Keyword Args:
             stream: Whether to stream the response. Defaults to False.
             session: The conversation session associated with the message(s).
-            kwargs: Additional keyword arguments.
 
         Returns:
             When stream=False: An Awaitable[AgentResponse].
             When stream=True: A ResponseStream of AgentResponseUpdate items.
         """
         if stream:
-            return self._run_stream_impl(messages=messages, session=session, **kwargs)
-        return self._run_impl(messages=messages, session=session, **kwargs)
+            return self._run_stream_impl(messages=messages, session=session)
+        return self._run_impl(messages=messages, session=session)
 
     async def _run_impl(
         self,
         messages: AgentRunInputs | None = None,
         *,
         session: AgentSession | None = None,
-        **kwargs: Any,
     ) -> AgentResponse:
         """Non-streaming implementation of run."""
         if not session:
@@ -269,7 +264,6 @@ class CopilotStudioAgent(BaseAgent):
         messages: AgentRunInputs | None = None,
         *,
         session: AgentSession | None = None,
-        **kwargs: Any,
     ) -> ResponseStream[AgentResponseUpdate, AgentResponse]:
         """Streaming implementation of run."""