Canonicalize the requested endpoint pair at the open-receipt boundary so reversing selection direction cannot duplicate one proposed world change while cancelled history remains reusable. Defense: wiki/mechanics/building.md defines a network link as one edge between two exact endpoints and an intent as one inert pinned job; an unordered pair therefore cannot own two simultaneous ghosts. 👾 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta Code <noreply@letta.com>