New drawing primitives: fill(x:, y:, w:, h:, bg:) — fills a rectangle with background color screen_fill(bg:) — fills the entire terminal Box now accepts bg: which fills its interior with a background color. All drawing methods (text, bar, list, box) now accept raw ANSI escape strings as style/highlight values in addition to named symbols. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>