Dark theme — [ResultFlow(Theme = ResultFlowTheme.Dark)] emits full dark classDef palette for all diagram types (_Pipeline, _LayerView, _ErrorSurface, _ErrorPropagation); MermaidInitDark constant fixes white-on-dark titles and edge label pills; both packages
Layer color centralization — Layer{n}_Style classDefs centralized in ResultFlowThemes.cs; depth-indexed subgraphs (Layer{depth}["ActualName"]); inner nodes keep NodeKind classDef; 2-colour alternating palette; both packages