Interface ChangeModelCapability

The minimal capability shape buildChangeModel reads: identity for blast radius, plus each field's own declared renamedFrom for rename correlation. CapabilityNode satisfies it structurally.

interface ChangeModelCapability {
    exportName: string;
    fields?: readonly {
        docs?: { renamedFrom?: string };
        path: readonly string[];
    }[];
    file: string;
}