Explain a trading signal by building a feature-contribution graph and running single-entry forward-push PageRank from the signal output node. Top-K ranked features are returned as a markdown table AND persisted to as a (ADR-126 Phase 6). Why this skill matters: - EU AI Act + SEC Reg-AI guidance require interpretable model output for any algorithmic trading system that touches retail capital. This is the regulator-grade attribution path the rest of the substrate has been waiting for. - The same call site picks up the full native-WASM PageRank from once that tool is registered in the runtime —…