refactor: extract viewer2d workspace package

packages/viewer2d/src/acadrustParser.ts

@@ -0,0 +1,20 @@
+/**
+ * acadrust DWG parser wrapper — loads the wasm built from rust/dwg-wasm
+ * (wasm-pack --target web, committed under ./acadrust-dwg).
+ */
+import init, { parse_dwg } from './acadrust-dwg/acadrust_dwg.js';
+import wasmUrl from './acadrust-dwg/acadrust_dwg_bg.wasm?url';
+import type { CadParseResult } from './dwgParser';
+
+let ready: Promise<void> | null = null;
+
+/** Initialize the acadrust WASM module once (idempotent). */
+export function initAcadrustParser(): Promise<void> {
+  if (!ready) ready = init({ module_or_path: wasmUrl }).then(() => undefined);
+  return ready;
+}
+
+/** Parse a DWG buffer. Requires initAcadrustParser() first. */
+export function parseDwgAcadrust(bytes: Uint8Array): CadParseResult {
+  return parse_dwg(bytes) as CadParseResult;
+}