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/helpers.ts

@@ -0,0 +1,23 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { isFunction } from './function.js';
+import { isObject } from './object.js';
+
+export function isOn <T> (...fns: (keyof T)[]): (value?: unknown) => value is T {
+  return (value?: unknown): value is T =>
+    (isObject(value) || isFunction(value)) &&
+    fns.every((f) => isFunction((value as T)[f]));
+}
+
+export function isOnFunction <T> (...fns: (keyof T)[]): (value?: unknown) => value is T {
+  return (value?: unknown): value is T =>
+    isFunction(value) &&
+    fns.every((f) => isFunction((value as T)[f]));
+}
+
+export function isOnObject <T> (...fns: (keyof T)[]): (value?: unknown) => value is T {
+  return (value?: unknown): value is T =>
+    isObject(value) &&
+    fns.every((f) => isFunction((value as T)[f]));
+}