- Forward reasoning_content and non-stream reasoning to on_token in
OpenAI chat completions; Gemini thought parts to on_token.
- Stream bubble: always render session.tool panels; format tool_use_call
payloads and title as call · tool_name.
- Emit tool_use_call via on_tool_ui before tool execution so WS shows
invoke cards before tool_use_result.
Co-authored-by: Cursor <cursoragent@cursor.com>