- Add 35 test data files covering all lexicon record types
- Actor records: block, membership, preferences, profile, saved, subscription
- Community records: moderator, profile, rules, wiki
- Interaction records: comment, share, tag
- Moderation records: ruleProposal, tribunalVote, vote
- Post records: post validation

- Fix lexicon schema issues:
- Add 'handle' format to actor profile
- Fix typo in community profile moderation type
- Add required $type field to interaction comments
- Add minItems constraint to tag arrays
- Fix enum values in moderation schemas

- Improve validate-lexicon tool:
- Better number handling to prevent float64 conversion issues
- Add json.Number support for accurate integer validation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

feat: Implement comprehensive lexicon validation system

- Add internal/validation/lexicon.go with ValidateLexiconData function
- Create validate-lexicon CLI tool for testing lexicon schemas
- Add comprehensive test suite with valid and invalid test cases
- Include test data for actors, communities, posts, interactions, and moderation
- Replace shell-based validation script with Go implementation
- Support for complex validation including enums, unions, and references

This provides a robust foundation for validating atProto lexicon data
in the Coves platform, ensuring data integrity and type safety.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

feat: Add domain knowledge documentation and update lexicon schemas