Writes a complete multi-touch cold outbound sequence (default four emails plus optional LinkedIn touches) from an ICP definition, a value proposition, and account context, with per-touch subject lines, bodies, timing, CTAs, and merge-field fallbacks. Trigger when the user says "write a cold sequence", "build a 4-touch cadence", "outbound sequence for this ICP", "follow-up emails", "cadence for this persona", "draft a campaign for these accounts", or asks for email 2 and 3 of an existing sequence. Do NOT trigger when the user only needs the personalized first sentence of one email (use personalization-writer), when they need a reply to a specific objection or a live thread…