readManifest static method
Reads and decodes the newest valid manifest for path without opening the
file (no sync handle is taken, so no lock is involved).
Implementation
static Future<WebFileManifest?> readManifest(String path) async {
final normalized = normalizeLogicalPath(path);
final pool = await OpfsWorkerPool.instance();
final loaded = await _loadBestManifest(pool.manifest, normalized);
return loaded?.state.snapshot(slot: loaded.slot);
}