Audit email campaigns and transactional email for weight and waste — heavy image templates, remote assets fetched per open, tracking-pixel sprawl, missing plain-text alternatives, send-volume hygiene (unengaged segments, over-frequency). Use this skill whenever the user shares email templates or campaign stats, works on newsletters or transactional email at scale, or asks about email sustainability, deliverability weight, or list hygiene. Part of Lean Agentic AI Skills; emits lean-findings.json.
