Two one-line compile blockers, a locale hazard in the persisted number codec, and a cost split showing the extension is nearly there while the instrument editor is a from-scratch X11 job.
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.