Add associative map constraints and range refinement

packages/decodal-wasm/README.md

@@ -28,7 +28,7 @@ await init();
 
 const files = {
   'main.dcdl': 'let schema = import "./schema.dcdl"; in schema.Server',
-  'schema.dcdl': 'Server = App.Server & { port = 8080; };',
+  'schema.dcdl': 'Server = { port = 8080; } as App.Server;',
 };
 
 const service = new DecodalLanguageService({
@@ -64,6 +64,6 @@ console.log(JSON.parse(completion));
 
 `globals`, `loadImport`, and `completeImport` are host-owned. The package does not assume a filesystem or virtual project model. Import callbacks are synchronous; preload or cache remote content before evaluation.
 
-Plain strings, numbers, booleans, arrays, and objects are concrete host values. Use `{ $decodal: 'String' | 'Int' | 'Float' | 'Bool' }` for primitive schemas and `{ $decodal: 'Array', item: value }` for array schemas. Descriptors also accept `constraints` and `default`.
+Plain strings, numbers, booleans, arrays, and objects are concrete host values. Use `{ $decodal: 'String' | 'Int' | 'Float' | 'Bool' }` for primitive schemas, `{ $decodal: 'Array', item: value }` for array schemas, and `{ $decodal: 'Map', value: value }` for associative-array schemas. Descriptors also accept `constraints` and `default`.
 
 Methods return JSON strings so callers can handle diagnostics and successful results without depending on Rust data structures.