Configurable timeout for AskUserQuestion tool

The AskUserQuestion tool auto-continues (picks a default/times out) after 60 seconds if the user hasn't responded yet. For longer-running interactive sessions, this can silently pick an unintended answer before the user has had a chance to read and respond.

Feature request: make this timeout configurable (e.g. via a settings.json key or env var), or allow disabling it so the prompt waits indefinitely for user input.