docs: add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to Pezkuwi SDK are documented here.
+
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+Versioning follows [Semantic Versioning](https://semver.org/).
+
+---
+
+## [Unreleased]
+
+### Added
+- GitLab CI/CD pipeline with unified image, nextest partitioning, rustdoc, mdbook
+- GitLab Pages for API documentation
+- SECURITY.md, CODEOWNERS, issue/MR templates
+- DEVELOPMENT.md contributor guide
+
+---
+
+## [0.44.0] — 2026-04-21
+
+### Added
+- Pezkuwi mainnet launch
+- Asset Hub with nomination pools staking
+- People Chain with IdentityKyc, Tiki, Trust, Referral, Nfts pallets
+- Zagros testnet environment
+- TNPoS (Trust-Nominated Proof of Stake) consensus
+- HEZ token (12 decimals)
+
+### Changed
+- Fork of Polkadot SDK — all Polkadot/Substrate references rebranded to Pezkuwi/Bizinikiwi/Pezcumulus
+- Signing context changed to "bizinikiwi"
+- SS58 prefix updated for Pezkuwi network
+
+### Attribution
+This SDK is derived from [polkadot-sdk](https://github.com/paritytech/polkadot-sdk)
+by Parity Technologies (UK) Ltd, licensed under Apache-2.0 and GPL-3.0-only.
+See [NOTICE](./NOTICE) for full attribution.
+
+---
+
+[Unreleased]: https://git.pezkuwichain.io/pezkuwichain/pezkuwi-sdk/compare/v0.44.0...HEAD
+[0.44.0]: https://git.pezkuwichain.io/pezkuwichain/pezkuwi-sdk/releases/tag/v0.44.0
+