Prints the commit hash and date a build was made from, handled directly
in main() before Wayland/dbus/PTY setup (same as --print-terminfo, so it
works with no display server).
VERSION_HASH/VERSION_DATE are #config values, "unknown" by default for a
plain `odin build .`. nix/package.nix wires in real values via -define:,
sourced from flake.nix's/home-manager-module.nix's self.shortRev (or
dirtyShortRev) and self.lastModifiedDate.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>