- DESIGN.md is now explicitly the constitution: functional changes ship with their spec amendment in the same commit; on disagreement the constitution wins. Decisions-log entry added. - knowledge/: current-state facts for future sessions — development style and working loop, architecture invariants (sim/frontend contract), sim mechanics with all tuning constants, art pipeline integration, build/verify/git workflows. Edited in place; staleness is a bug. - CLAUDE.md routes every agent session through constitution -> development style -> knowledge before changes. - README leads with the development-style section.