Generate email sequences (welcome, nurture, launch, cold outreach, cart abandon, re-engagement, onboarding) with subject line variants, cadence, and metrics benchmarks. Invoke whenever the user says "email sequence", "welcome series", "nurture", "cold outreach", "win-back", or runs `/market emails <
Generate email sequences (welcome, nurture, launch, cold outreach, cart abandon, re-engagement, onboarding) with subject line variants, cadence, and metrics benchmarks. Invoke whenever the user says "email sequence", "welcome series", "nurture", "cold outreach", "win-back", or runs `/market emails <type>`. Matches BRAND-VOICE.md if present.