HierarchyReaderPort

• get_node
  (node_id: UUID) -> NodeInfo | None
  Get node info (parent_id, position, is_archived)
• get_children
  (parent_id: UUID | None) -> list[NodeInfo]
  Get children of a node, ordered by position
• get_ancestors
  (node_id: UUID, include_self=False) -> list[NodeInfo]
  Get ancestors from node to root
• get_roots
  () -> list[NodeInfo]
  Get all root nodes (no parent), ordered by position
• get_depth
  (node_id: UUID) -> int
  Get depth of node in tree (root = 0)

No implementations registered

• todos optional