Model Delivery shared contracts

Private @model/shared package used by web, API and mobile. Contains Zod schemas, TypeScript types and fixed-point price calculation.

corepack enable
pnpm install --frozen-lockfile
pnpm typecheck
pnpm test
pnpm build

See repository ownership and releases and sync contract. Generated dist is intentionally committed to support immutable Git dependencies without running install-time compilation or requiring registry credentials. Never edit dist by hand.