A comprehensive, rigorously tested skill for writing copy, building campaigns, and auditing marketing pages. Features progressive disclosure (lightweight router + 9 deep-dive reference modules), two quality gates that ask before guessing, and a universal quality bar (specificity, reader-first, one message per piece, proof over claims, honesty). Includes a 26-prompt eval suite with real benchmark results (+20pp over baseline), raw outputs. Works with any tool that can read SKILL.md
