2026-07-06: MDI energy-contact method

The Dimer Builder’s contact method = energy was added as part of the campaign that created the reusable seamm_mdi MDI driver facility. That campaign’s full write-up – motivation, design, the socket-direction decision, and the cross-package changes (including this plug-in) – lives with the facility:

• seamm_mdi developer guide: https://molssi-seamm.github.io/seamm_mdi/developer_guide/campaigns/2026-07-06/NOTES.html