Initial rebrand: @polkadot -> @pezkuwi (14 packages)

- Package namespace: @polkadot/* -> @pezkuwi/*
- Repository: polkadot-js/common -> pezkuwichain/pezkuwi-common
- Author: Pezkuwi Team <team@pezkuwichain.io>

Core packages:
- @pezkuwi/util (utilities)
- @pezkuwi/util-crypto (crypto primitives)
- @pezkuwi/keyring (account management)
- @pezkuwi/networks (chain metadata)
- @pezkuwi/hw-ledger (Ledger hardware wallet)
- @pezkuwi/x-* (10 polyfill packages)

Total: 14 packages
Upstream: polkadot-js/common v14.0.1

packages/util/src/is/wasm.ts

@@ -0,0 +1,17 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { u8aEq } from '../u8a/eq.js';
+import { isU8a } from './u8a.js';
+
+const WASM_MAGIC = new Uint8Array([0, 97, 115, 109]); // \0asm
+
+/**
+ * @name isWasm
+ * @summary Tests if the input has a WASM header
+ * @description
+ * Checks to see if the input Uint8Array contains a valid WASM header
+ */
+export function isWasm (value?: unknown): value is Uint8Array {
+  return isU8a(value) && u8aEq(value.subarray(0, 4), WASM_MAGIC);
+}