Lazy self-installing Python scripts with uv

Python developers can now create self-installing command-line scripts using uv, which manages dependencies and virtual environments automatically. By adding a special shebang line and comment, uv creates a virtual environment, installs required packages, and runs the script. This simplifies dependency management for small scripts without creating full Python packages or managing separate virtual environments. uv can also replace tools like pipx for installing Python-based command-line tools and potentially serve as an alternative to pyenv.