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/lib/src/common/chain_spec.rs

@@ -0,0 +1,102 @@
+// 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.
+
+//! Chain spec primitives.
+
+pub use pezsc_chain_spec::ChainSpec;
+use pezsc_chain_spec::ChainSpecExtension;
+use serde::{Deserialize, Serialize};
+use std::fmt::Debug;
+
+/// Helper trait used for loading/building a chain spec starting from the chain ID.
+pub trait LoadSpec {
+	/// Load/Build a chain spec starting from the chain ID.
+	fn load_spec(&self, id: &str) -> Result<Box<dyn ChainSpec>, String>;
+}
+
+/// Default implementation for `LoadSpec` that just reads a chain spec from the disk.
+pub struct DiskChainSpecLoader;
+
+impl LoadSpec for DiskChainSpecLoader {
+	fn load_spec(&self, path: &str) -> Result<Box<dyn ChainSpec>, String> {
+		Ok(Box::new(GenericChainSpec::from_json_file(path.into())?))
+	}
+}
+
+/// Generic extensions for Teyrchain ChainSpecs used for extracting the extensions from chain specs.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, ChainSpecExtension)]
+pub struct Extensions {
+	/// The relay chain of the Teyrchain. It is kept here only for compatibility reasons until
+	/// people migrate to using the new `Extensions` struct and associated logic in the node
+	/// corresponding to pulling the teyrchain id from the runtime.
+	#[serde(alias = "relayChain", alias = "RelayChain")]
+	relay_chain: String,
+	/// The id of the Teyrchain.
+	#[serde(alias = "paraId", alias = "ParaId")]
+	para_id: Option<u32>,
+}
+
+impl Extensions {
+	/// Try to get the extension from the given `ChainSpec`.
+	pub fn try_get(chain_spec: &dyn pezsc_service::ChainSpec) -> Option<&Self> {
+		pezsc_chain_spec::get_extension(chain_spec.extensions())
+	}
+
+	/// Create the extensions only with the relay_chain.
+	pub fn new_with_relay_chain(relay_chain: String) -> Self {
+		Extensions { relay_chain, para_id: None }
+	}
+
+	/// Initialize extensions based on given parameters.
+	pub fn new(relay_chain: String, para_id: u32) -> Self {
+		Extensions { relay_chain, para_id: Some(para_id) }
+	}
+
+	/// Para id field getter
+	pub fn para_id(&self) -> Option<u32> {
+		self.para_id
+	}
+
+	/// Relay chain field getter
+	pub fn relay_chain(&self) -> String {
+		self.relay_chain.clone()
+	}
+}
+
+/// Generic chain spec for all pezkuwi-teyrchain runtimes
+pub type GenericChainSpec = pezsc_service::GenericChainSpec<Extensions>;
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn can_decode_extension_camel_and_snake_case() {
+		let camel_case = r#"{"relayChain":"relay","paraId":1}"#;
+		let snake_case = r#"{"relay_chain":"relay","para_id":1}"#;
+		let pascal_case = r#"{"RelayChain":"relay","ParaId":1}"#;
+		let para_id_missing = r#"{"RelayChain":"zagros"}"#;
+
+		let camel_case_extension: Extensions = serde_json::from_str(camel_case).unwrap();
+		let snake_case_extension: Extensions = serde_json::from_str(snake_case).unwrap();
+		let pascal_case_extension: Extensions = serde_json::from_str(pascal_case).unwrap();
+		let missing_paraid_extension: Extensions = serde_json::from_str(para_id_missing).unwrap();
+		assert_eq!(camel_case_extension, snake_case_extension);
+		assert_eq!(snake_case_extension, pascal_case_extension);
+		assert_eq!(missing_paraid_extension.relay_chain, "zagros".to_string());
+		assert!(missing_paraid_extension.para_id.is_none());
+	}
+}