feat: Rebrand Polkadot/Substrate references to PezkuwiChain

This commit systematically rebrands various references from Parity Technologies'
Polkadot/Substrate ecosystem to PezkuwiChain within the kurdistan-sdk.

Key changes include:
- Updated external repository URLs (zombienet-sdk, parity-db, parity-scale-codec, wasm-instrument) to point to pezkuwichain forks.
- Modified internal documentation and code comments to reflect PezkuwiChain naming and structure.
- Replaced direct references to  with  or specific paths within the  for XCM, Pezkuwi, and other modules.
- Cleaned up deprecated  issue and PR references in various  and  files, particularly in  and  modules.
- Adjusted image and logo URLs in documentation to point to PezkuwiChain assets.
- Removed or rephrased comments related to external Polkadot/Substrate PRs and issues.

This is a significant step towards fully customizing the SDK for the PezkuwiChain ecosystem.

pezcumulus/pezkuwi-omni-node/tests/extra_subcommand_parsing_test.rs

@@ -0,0 +1,39 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// This file is part of Pezcumulus.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Integration tests that spawn the actual binary `pezkuwi-omni-node`
+/// using `assert_cmd`. We verify that the help text
+/// excludes the `export-chain-spec` sub‑command exactly as intended
+use assert_cmd::Command;
+
+#[test]
+fn pezkuwi_omni_node_help_excludes_export_chain_spec() {
+	// Run `pezkuwi-omni-node --help` and capture stdout.
+	let output = Command::cargo_bin("pezkuwi-omni-node")
+		.expect("binary `pezkuwi-omni-node` should be built by the workspace")
+		.arg("--help")
+		.assert()
+		.success()
+		.get_output()
+		.stdout
+		.clone();
+
+	let help_text = String::from_utf8_lossy(&output);
+	assert!(
+		!help_text.contains("export-chain-spec"),
+		"`pezkuwi-omni-node --help` must NOT list the \"export-chain-spec\" subcommand"
+	);
+}