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/buffer/toU8a.ts

@@ -0,0 +1,20 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * @name bufferToU8a
+ * @summary Creates a Uint8Array value from a Buffer object.
+ * @description
+ * `null` inputs returns an empty result, `Buffer` values return the actual value as a `Uint8Array`. Anything that is not a `Buffer` object throws an error.
+ * @example
+ * <BR>
+ *
+ * ```javascript
+ * import { bufferToU8a } from '@pezkuwi/util';
+ *
+ * bufferToU8a(Buffer.from([1, 2, 3]));
+ * ```
+ */
+export function bufferToU8a (buffer?: Uint8Array | number[] | null): Uint8Array {
+  return new Uint8Array(buffer || []);
+}