1. Executive Summary & Design Paradigm Iume is an ultra-fast, smooth, continuous horizontal sliding window manager engineered natively for macOS (macOS 14.0 Sonoma through macOS 26.x Sequoia/Tahoe).

A working, checkable backlog for where TS4MM could go next, grouped by area. Nothing here is a promise or a schedule. Check a box off when its change actually ships (with a matching entry in CHANGELOG ...