The union of every id reached: seeds, every group's expressIds, and
every group's relationshipIds. This — not any one group — is what a
caller passes as StepExportOptions.subsetEntityIds.
One entry per (relationship, role) that contributed anything, in walk order — the shape a UI groups a related-entity list by.
The caller's original seed selection, echoed back unfiltered.
true when the walk's work budget was exhausted before it reached a
fixpoint (Bounding walks over file-supplied references, AGENTS.md) —
the result is a valid, boundable subset of what a complete walk would
have found, not the complete answer.
The full result of one
collectRelatedEntitiescall.