Adds a timezone step between cli-agent and channel wiring in setup:auto. Autodetect via --step timezone; if it resolves to UTC or fails, confirm with the user and accept either an IANA zone or a free-text description (e.g. "New York"). Free-text falls through to a headless `claude -p` call that returns a single IANA string, gated on the claude CLI being on PATH. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>