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docs: C21/C22 — the World is the product; playground is a trace explorer

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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>
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2026-06-03 10:47:16 +02:00
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@@ -110,3 +110,15 @@ design decision, not a refactor, and belongs in the ledger.
blueprint). The harness — sources + strategy + broker node(s) + sinks — is
the root sim graph, itself bootstrapped, and is C1's disjoint unit; its
structural axes form the experiment matrix, its tuning params the sweep.
12. **The World is the product; the playground is a trace explorer.** Three
ontological tiers: a *node* is an open, composable fragment (at most one
output, C8); a *harness* is the closed root graph that runs (sources +
strategy + brokers + sinks + clock — C1's disjoint unit / root scope),
**not** a node; the *World* is the program that dynamically constructs and
orchestrates *families* of harnesses (walk-forward / sweep / MC / comparison)
— aura's differentiator, not the single backtest. The World is a program:
nothing is displayable until it runs, and what is displayable is exactly what
a **sink** (C8) records into the registry (C18). The playground plays *any*
harness and is an execution viewer / trace explorer (structure before, live
streams during, recorded traces after) — never a scene editor; topology is
grown in Rust + hot-reload, runtime params are UI-tunable.