The wave-* planning docs record their wave, not current state. Add a
consistent "Historical record — superseded" banner to each, pointing to
README (Current Status), UI-UX-GUIDE, and the route registry as the live
sources. wave-1/R/M-worthiness/M-consolidation covered.
Docs only.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>