Covers prerequisites (alsa-lib-devel on Fedora / libasound2-dev on
Debian), default vs --no-default-features build, the three binaries
with concrete invocations, the TUI keybindings and --preset CLI
aliases, a sketch of the architecture, and beat-detector tuning notes.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>