Default progress, quote wrappers, tool-error copy, and playbook recipes to English unless lang is explicitly zh.
Co-authored-by: Cursor <cursoragent@cursor.com>
Wire channel inbound on_progress/on_tool_ui to outbound queue so group users see wait signals for CLI/UME work without sharing per-speaker session context.
Co-authored-by: Cursor <cursoragent@cursor.com>