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/x-fetch/src/node.ts

@@ -0,0 +1,31 @@
+// Copyright 2017-2025 @polkadot/x-fetch authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { extractGlobal } from '@pezkuwi/x-global';
+
+export { packageInfo } from './packageInfo.js';
+
+// This is an ESM module, use the async import(...) syntax to pull it
+// in. Logically we would like it in nodeFetch(...) itself, however
+// while it is all-ok on Node itself, it does create issues in Jest,
+// possibly due to the Jest 28 need for --experimental-vm-modules
+const importFetch = import('node-fetch').catch(() => null);
+
+// keep track of the resolved import value
+let modFn: typeof fetch | null = null;
+
+async function nodeFetch (...args: Parameters<typeof fetch>): Promise<Response> {
+  if (!modFn) {
+    const mod = await importFetch;
+
+    if (!mod?.default) {
+      throw new Error('Unable to import node-fetch in this environment');
+    }
+
+    modFn = mod.default as unknown as typeof fetch;
+  }
+
+  return modFn(...args);
+}
+
+export const fetch = /*#__PURE__*/ extractGlobal('fetch', nodeFetch);