Turn a designer-authored code prototype into a design brief for one ticket. Resolves a preview URL to a pinned commit in the prototype repo, or reads a prototype directory in this working tree where the adapter names one, reads the spec and the prototype source there, reads the in-scope screenshots as images, filters it to what the ticket covers, renders the ticket's overrides on top, and resolves every element and token against the project's design-system catalog into a per-element fidelity ledger. Asks nothing — every judgement becomes a row the grill can question. Invoke /figma-tools:prototype-to-spec <preview-url> <ticket>.
