| @objectstack/spec | patch |
|---|
feat(spec): add the back edge style to the flow-builder canvas protocol
FlowCanvasEdgeStyleSchema gains a back value alongside solid/dashed/dotted/bold, marking an ADR-0044 declared back-edge (a revise loop's resubmit edge). Flow-builder-protocol consumers can now render it as a distinct curved/dashed return arc, set apart from forward flow — matching the objectui designer's hand-rolled canvas (objectstack-ai/objectui#1954). Part of #2274.