Create or replace the todo checklist for the current chat. Pass the FULL list of items every time (the stored list is replaced, not merged). Each item has text and a status of "pending", "in_progress", or "done". Use this to plan and track multi-step work — mark an item "in_progress" before starting it and "done" when finished — so progress is visible to the user and survives across sessions. Requires a chatid from an ACTIVE Ask-stub chat session — the id cannot be minted via MCP, so this tool applies only when operating inside a chat. Never include ids; name records by number, name, amount or date.