Refactors the diff renderer to support displaying GitHub review comments
inline with the relevant diff lines. Links review comments to specific
file positions using reviewThreads data from the GraphQL API, enabling a
more intuitive code review experience directly within the diff view.
- Refactored gh/api.lua to async fetch review comments and threads
- Added annotation support to diff renderer with context object pattern
- Separated diff parsing from formatting for better maintainability
- Integrated review comment positioning via reviewThreads linkage
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
