chore: remove dead code identified by knip analysis (#135)

Removes 11 unused files that were identified as completely unused by knip dead code analysis:
- comment-checker filter modules and constants
- comment-checker output formatters
- ast-grep napi binding
- interactive-bash types

🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

Author: code-yeongyu