Add explicit CRDT edit contracts and structured query values

src/capability-language/generic-types.ts

@@ -108,6 +108,7 @@ export class GenericSourceTypes {
         return parameter?.kind === "value" && Boolean(parameter.storable);
       }
       if (type.kind === "list" || type.kind === "optional") return storable(type.value, depth + 1);
+      if (type.kind === "record") return Object.values(type.fields).every((field) => storable(field, depth + 1));
       if (type.kind === "alias") {
         const alias = aliases.get(type.definitionId);
         if (!alias || alias.parameters.length !== type.arguments.length) return false;
@@ -318,6 +319,12 @@ export class GenericSourceTypes {
       return { kind: "record", fields: Object.fromEntries(fields) };
     }
     const name = context.identifier()!.getText();
+    if (name === "change" && context.typeArguments())
+      throw new GenericTypeError(
+        "unsupported-prepared-change",
+        name,
+        "Authored change<T> transport values require LF-19; native edit contracts are available separately",
+      );
     if (context.ATOM_REF()) return { kind: "object-ref", expectation: this.atom(name) };
     if (context.INTERFACE_REF())
       return {