MatAddonExtensions

Module-augmentable seam for adding custom addon kinds to mat-input at the type level. Pair with withCustomAddon(...) for the runtime side:

declare module '@ng-forge/dynamic-forms-material' {
  interface MatAddonExtensions {
    'my-rating': MyRatingAddon;
  }
}

Empty by default — the extension lookup resolves to never and contributes nothing to the union.