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/promisify.spec.ts

@@ -0,0 +1,50 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { promisify } from './index.js';
+
+describe('promisify', (): void => {
+  it('handles functions with no parameters (resolve)', (): Promise<void> => {
+    const fn = (cb: (error: null, value: [boolean, string, number]) => void): void =>
+      cb(null, [true, 'test', 1]);
+
+    return promisify(null, fn).then((result): void => {
+      expect(result).toEqual([true, 'test', 1]);
+    });
+  });
+
+  it('handles functions with no parameters (reject)', (): Promise<void> => {
+    const fn = (cb: (error: Error, result?: boolean) => void): void =>
+      cb(new Error('test reject'));
+
+    return promisify(null, fn)
+      .then((): void => {
+        throw new Error('Received unexpected result');
+      })
+      .catch((error: Error): void => {
+        // eslint-disable-next-line jest/no-conditional-expect
+        expect(error.message).toEqual('test reject');
+      });
+  });
+
+  it('handles functions with parameters (resolve)', (): Promise<void> => {
+    const fn = (a: number, b: boolean, cb: (error: Error | null, result?: [number, boolean]) => void): void =>
+      cb(null, [a, b]);
+
+    return promisify(null, fn, 2, false).then((result: [number, boolean]): void => {
+      expect(result).toEqual([2, false]);
+    });
+  });
+
+  it('handles functions with parameters (reject)', (): Promise<void> => {
+    const fn = (a: number, b: boolean, c: string, cb: (error: Error | null, result?: [number, boolean, string]) => void): void =>
+      cb(new Error(`test reject: ${a},${b.toString()},${c}`));
+
+    return promisify(null, fn, 3, 'string', true).catch((error: Error): void => {
+      // eslint-disable-next-line jest/no-conditional-expect
+      expect(error.message).toEqual('test reject: 3,string,true');
+    });
+  });
+});