docs: add missing CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.1.3] - 2025-11-21
+
+### Fixed
+- **Core Version Sync**: Fixed an issue where the wrapper attempted to download a non-existent `v2.1.2` of `capiscio-core`. It now correctly downloads `v1.0.2`.
+- **Package Versioning**: Bumped package version to `2.1.3` to resolve PyPI conflicts while pointing to the stable `v1.0.2` core binary.
+
+## [2.1.2] - 2025-11-21
+
+### Added
+- **CLI Wrapper**: Initial release of the new Python CLI wrapper.
+- **Architecture**: Replaced the legacy Python library with a lightweight wrapper that downloads and executes the high-performance Go binary (`capiscio-core`).
+- **Platform Support**: Automatic detection and download for Linux, macOS, and Windows (AMD64/ARM64).
+- **Zero Dependencies**: The wrapper itself has minimal dependencies (`rich`, `platformdirs`, `requests`) and delegates all logic to the standalone binary.
+
+### Removed
+- **Legacy Library**: Removed the old Python implementation of the validation logic in favor of the unified Go core.