refactor: migrate comment lexicon namespace to community
Migrate comment record lexicon from social.coves.feed.comment to
social.coves.community.comment to align with community-focused
architecture.
Changes:
- Move lexicon from feed/comment.json to community/comment.json
- Update lexicon ID: social.coves.community.comment
- Update test data lexicons (3 files) to use new namespace
This is part of the broader namespace migration to organize all
community-related records under the community namespace.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>