BUG-360: stream thinking and tool activity as an ordered trace so later CoT opens under 正在整理 instead of filling the first 思考 block.
Co-authored-by: Cursor <cursoragent@cursor.com>
Keep provider thinking on a separate channel so process talk is not billed as the spoken reply (BUG-359).
Co-authored-by: Cursor <cursoragent@cursor.com>