Brummel
e2dcc7471d
Anchor the world/playground bundle. C21 (the World: harnesses are dynamically constructible first-class objects; orchestrating families of them via the C12 axes is aura's differentiator, not the single backtest which is commodity; registry is the World's memory). C22 (the World is a program -> nothing displayable until it runs; the only durable displayable substance is the recorded trace; sinks (C8) are the recording mechanism into the registry (C18); the playground plays ANY harness and is a trace explorer / execution viewer, never a scene editor; observability is explicit/selective; samples ship with sinks). Sharpen C20 (open node vs closed harness; a harness is NOT a node, it is the closure that runs / the root scope; harnesses do not nest as nodes — the World orchestrates them as objects). Correct C14 (playground is core, not 'freely deferrable'). Foundation positioning (World = product, single-harness engine = substrate). CLAUDE.md invariant 12; project-layout day-in-the-life. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>