- Update Comment.js with class-based structure and standardized error handling
- Add constructor validation for required fields (user.userId, post.postId, content)
- Implement withErrorHandling wrapper for all static methods
- Add toJSON() and save() instance methods
- Fix test infrastructure to use global mocks
- Fix couchdbService method calls (updateDocument vs updatePost)
- 1/19 tests passing - remaining tests need field name updates
- Core error handling infrastructure working correctly
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