OptionalparentBreakFlag: { shouldBreak: boolean }OptionalbranchPath: stringOptionaltraversalContext: TraversalContextExecute selected children based on selector result. Validates IDs, records selection info, then delegates to executeNodeChildren.
OptionaltraversalContext: TraversalContextOptionalfailFast: boolean
Execute all children in parallel. Each child commits on settle. Uses Promise.allSettled to ensure all children complete even if some fail.