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-textencoder/src/fallback.ts

@@ -0,0 +1,16 @@
+// Copyright 2017-2025 @polkadot/x-textencoder authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// This is very limited, only handling Ascii values
+export class TextEncoder {
+  encode (value: string): Uint8Array {
+    const count = value.length;
+    const u8a = new Uint8Array(count);
+
+    for (let i = 0; i < count; i++) {
+      u8a[i] = value.charCodeAt(i);
+    }
+
+    return u8a;
+  }
+}