KrsMt-0113

Manage local XMU TronClass sign-in accounts and perform one-shot rollcall checks or answers without any WeChat integration. Use when Codex needs to bootstrap the repo-local sign-in skill, add or update stored XMU accounts, delete or switch the active account, inspect current rollcalls, or answer active XMU 签到 directly from an agent while keeping all runtime files inside this skill directory.