Score a blind build cell-for-cell against the live table

For migrations: this project's target layer already exists, so every AI build can be graded against it — the answer key the model never saw while building. Reveal the live table, score every cell, and close any gaps with the guided resolve flow; each answer persists as a convention that steers all future builds. Greenfield tables don't appear here — with no existing layer there is nothing to compare against, and their verdict comes from the answer-key-free gates on Create Layer.