Thread RP_DEBUG-driven logging through input, detection, rendering, and pager decisions so CLI behavior is inspectable without polluting stdout. Add focused coverage for debug wiring, env parsing, and stderr-only output.
- Add typer CLI with auto file-type detection by extension
- Support markdown (rich.Markdown), JSON (rich.JSON), and 30+ code
languages via Pygments syntax highlighting
- Features: line numbers toggle, pager support, stdin input,
configurable color themes
- Project metadata: MIT license, author, classifiers, entry point