Add comprehensive CHANGELOG validation to release validation process:
- Add _validate_changelog() method that validates CHANGELOG.md against
changelog-schema-v1.0.md using markitect validate --semantic
- Add validate_changelog_version() to check version section exists with
proper date format and Unreleased section
- Add check_version_tag_consistency() to verify CHANGELOG versions
match git tags
- Integrate CHANGELOG validation into validate_release_state()
- Add CHANGELOG-specific recommendations to _get_recommendations()
This prevents releases with invalid or inconsistent CHANGELOG files,
catching format errors before they become problems.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
tegwick
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