Add initial CHANGELOG.md

[edevsh]

Summary

This PR introduces CHANGELOG.md

Closes

• Fixes Missing CHANGELOG.md file in the repository #43

[edevsh]

@codex please update the PR

The file must:

• Follow the Keep a Changelog format
• Use Semantic Versioning (x.x.x)

Required structure:

## [Unreleased]

## [X.X.X] - YYYY-MM-DD
### Added
### Fixed
### Changed

Notes:

• Each entry should be human-readable.

  • ✅ Example: “Implemented string type with format alternatives based on AT Protocol principles”
  • 🚫 Avoid: “Feat(Syntax/StringType): Implement StringType constraint and validator with formats”

• For low-level internal changes (like SchemaFactory), include them only if you can describe them meaningfully; otherwise, omit them.

[chatgpt-codex-connector]

Summary

• Reformatted the changelog to follow Keep a Changelog conventions with Semantic Versioning headings. CHANGELOG.mdL1-L19
• Documented the initial 0.1.0 release with human-readable Added, Fixed, and Changed entries. CHANGELOG.mdL10-L19

Testing

• ⚠️ Tests not run (not requested).

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