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/testChain.spec.ts

@@ -0,0 +1,25 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { isTestChain } from './index.js';
+
+describe('isTestChain', (): void => {
+  it('enables test environment when chain specification matches text of dev or loc(al)', (): void => {
+    const validTestModeChainSpecsWithDev = ['Development'];
+    const validTestModeChainSpecsWithLoc = ['Local Testnet'];
+
+    validTestModeChainSpecsWithDev.concat(validTestModeChainSpecsWithLoc).forEach((s): void => {
+      expect(isTestChain(s)).toEqual(true);
+    });
+  });
+
+  it('disables keyring test mode when chain specification is not a test mode or undefined or number type', (): void => {
+    const invalidTestModeChainSpecs = ['dev', 'local', 'development', 'PoC-1 Testnet', 'Staging Testnet', 'future PoC-2 Testnet', 'a pocadot?', undefined];
+
+    invalidTestModeChainSpecs.forEach((s): void => {
+      expect(isTestChain(s)).toEqual(false);
+    });
+  });
+});