Drop CBOR for simple custom manifest

ext/js/src/bundle.js

@@ -18,12 +18,12 @@
  *     Offset        8B  u64 BE
  *     Length        8B  u64 BE
  *     SHA256Digest 32B raw
- *   Manifest: canonical CBOR-encoded map (cborg output from Haskell)
+ *   Manifest: fixed-order core + TLV tail (ARBMNFST magic)
  *   Nodes: binary section
  */
 
 import { createHash } from "node:crypto";
-import { decodeCbor } from "./cbor.js";
+import { decodeManifest } from "./manifest.js";
 
 // ── Constants ───────────────────────────────────────────────────────────────
 
@@ -173,37 +173,12 @@ export function parseBundle(buffer) {
 }
 
 /**
- * Post-process a CBOR-decoded manifest to normalize hash fields
- * from raw bytes to hex strings (matching the old JSON wire format).
- */
-function normalizeManifest(raw) {
-  const tree = raw.tree;
-  if (tree && tree.nodeHash && tree.nodeHash.domain) {
-    tree.nodeHash.domain = tree.nodeHash.domain;
-  }
-
-  // Convert root hashes from raw bytes to hex
-  const roots = (raw.roots || []).map((r) => ({
-    ...r,
-    hash: r.hash instanceof Uint8Array ? Buffer.from(r.hash).toString("hex") : r.hash,
-  }));
-
-  // Convert export root hashes from raw bytes to hex
-  const exports = (raw.exports || []).map((e) => ({
-    ...e,
-    root: e.root instanceof Uint8Array ? Buffer.from(e.root).toString("hex") : e.root,
-  }));
-
-  return { ...raw, roots, exports };
-}
-
-/**
- * Convenience: parse and return the manifest from CBOR.
+ * Convenience: parse and return the manifest from the fixed-order binary format.
  */
 export function parseManifest(buffer) {
   const bundle = parseBundle(buffer);
   const manifestEntry = bundle.sections.get(SECTION_MANIFEST);
-  return normalizeManifest(decodeCbor(manifestEntry.data));
+  return decodeManifest(manifestEntry.data);
 }
 
 /**