README: replace LD_PRELOAD with MOONGREET_NO_LAYER_SHELL env var,
add missing features (GPU blur, journal logging, password wiping).
build.rs: remove wallpaper.jpg reference.
moongreet.toml: correct gtk-theme to Colloid-Grey-Dark-Catppuccin.
Complete rewrite of the greetd greeter from Python/PyGObject to Rust/gtk4-rs
for consistency with moonset, single binary without Python runtime, and
improved security through Rust memory safety.
Modules: main, greeter, ipc, config, i18n, users, sessions, power
86 unit tests covering all modules including login_worker IPC flow.
Security hardening: shell-word splitting for exec_cmd, absolute path
validation for session binaries, session-name sanitization, absolute
loginctl path, atomic IPC writes.
