Takes one named ad, your own top performer or a competitor ad pulled from a public ad library, and reverse-engineers it into a reusable pattern of angle, promise, proof and structure, separating what transfers from what does not. Use when a single ad has been singled out for imitation and somebody needs to know which part is actually copyable. Boundary against siblings: creative-brief-from-account-data reads a whole export and issues production slots, angle-inventory counts coverage across the library, and this skill looks at exactly one ad.
