GitVaulty 4.0.0

• Select specific files with positional paths, such as gitvaulty materialize .env config/secrets.yaml.
• Reassign -f and --force to explicitly replace modified, untracked regular plaintext with the
  encrypted source.
• Continue rejecting tracked plaintext, symlinks, directories, unsafe paths, and unauthorized files
  even when force is requested.
• Remove the materialize --file <path> interface. Update scripts to use positional paths.