Split root CLAUDE.md into 19 per-directory files scoped to their source area.
Roll v0 history into docs/ARCHIVE.md; retire CONTEXT.md, CONTEXT-ARCHIVE.md,
PLAN.md, COMPLETED.md. Move plan docs under docs/. Rescue 9 live deferrals
into docs/TODO.md.
Item-level mode separation via REAPER fixed lanes; new content auto-tags to
the active mode; inactive lanes hidden and silenced; a managed-vs-manual lane
index keeps toggles off user comp lanes; capture placement mode-aware.
Precision invariants unaffected; REAPER 7 floor.