Brummel
e7393f6809
Enrich the `aura graph` / `aura sweep` sample blueprint into a "trend + momentum, weighted blend" strategy that showcases four authoring/viewer capabilities the single-level sample left dark: multiply-nested composites, a multi-param node inside a composite, a multi-output (MACD-like) node, and bind() (a param fixed as a structural constant, dropped from the sweep surface). Pure authoring over already-shipped primitives — no engine semantics or viewer change; reuses the existing sma_cross/macd builders. Auto-signed under /boss (spec auto-sign enabled): objective gates green (precondition clean, self-review clean, grounding-check PASS) and a unanimous five-lens spec-skeptic panel (criterion, grounding, scope-fork, ambiguity, plan-readiness) returned SOUND. Design provenance recorded on #62. refs #62