- Introduces `shopify app import-custom-data-definitions` (CLI v3.89) to migrate existing app‑owned metafield and metaobject definitions to declarative TOML
- Generates TOML definitions for inclusion in `shopify.app.toml`, enabling version‑controlled, centrally managed definitions across all installed shops
- Supports full or incremental migration, then test with `shopify app dev` and deploy with `shopify app deploy` to replace manual definition code