Overview, artifacts, prerequisites, platform support, setup, build/test, install, and repo layout, matching current CMake targets and channel support.
mac_resgen.php does not exist. 34 CONTEXT.md citations retargeted to CONTEXT-ARCHIVE.md; 6 self-inverted refs in the archive corrected.
README was frozen at Milestone 0. TODO.md was entirely M0-M2 tasks, all landed. CONTEXT.md intro cited a file deleted in M0.
Retarget README to ReaSampler and current build targets; reconcile CLAUDE.md repo-identity + targets table to reaper_reasampler; archive Milestone 0 from PLAN.md into new COMPLETED.md.