53ad78f7fb
- Added comprehensive documentation for @oh-my-pi/pi-natives architecture covering three-layer design (TypeScript wrapper, addon loading/validation, Rust N-API module). - Added deep-dive documentation for addon loading runtime including platform support, CPU variant selection, embedded addon extraction lifecycle, and validation contracts. - Added binding contract documentation defining TypeScript-side API surface, wrapper behavior, and N-API addon validation with maintainer checklist. - Added subsystem deep-dives for text/search pipeline (grep, glob, fs_cache, ANSI utilities), shell/PTY/process execution, task cancellation patterns, and media/system utilities.