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.

bizinikiwi/primitives/runtime/src/generic/tests.rs

@@ -0,0 +1,55 @@
+// This file is part of Bizinikiwi.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// 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.
+
+//! Tests for the generic implementations of Extrinsic/Header/Block.
+
+use super::DigestItem;
+use crate::codec::{Decode, Encode};
+
+#[test]
+fn system_digest_item_encoding() {
+	let item = DigestItem::Consensus([1, 2, 3, 4], vec![5, 6, 7, 8]);
+	let encoded = item.encode();
+	assert_eq!(
+		encoded,
+		vec![
+			4, // type = DigestItemType::Consensus
+			1, 2, 3, 4, 16, 5, 6, 7, 8,
+		]
+	);
+
+	let decoded: DigestItem = Decode::decode(&mut &encoded[..]).unwrap();
+	assert_eq!(item, decoded);
+}
+
+#[test]
+fn non_system_digest_item_encoding() {
+	let item = DigestItem::Other(vec![10, 20, 30]);
+	let encoded = item.encode();
+	assert_eq!(
+		encoded,
+		vec![
+			// type = DigestItemType::Other
+			0,  // length of other data
+			12, // authorities
+			10, 20, 30,
+		]
+	);
+
+	let decoded: DigestItem = Decode::decode(&mut &encoded[..]).unwrap();
+	assert_eq!(item, decoded);
+}