README now documents all features, 14 config keys, full CLI reference,
keyboard shortcuts, platform support, and project structure. Previous
README covered ~40% of actual functionality. Added docs/plans/README.md
noting these are historical ADRs from the initial build.
Added 9 new README tests verifying all settings keys are documented,
clipboard features, keyboard shortcuts, auth modes, platform support,
ANSI previews, hover preview, and view modes.
Brian Krabach
66f58a6f4b