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C3: Convexification/preprocessing layer for MindtPy and GDPopt #17

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@bernalde

Slide 16's Coramin item never happened: Coramin remains external (only a link in doc/OnlineDocs/related_packages.rst), and the MC++ shim is frozen at v19.11.12 (2019). Decide the convexification strategy:

  • Integrate Coramin-style factorable relaxations (OBBT + relaxation refinement) as an optional preprocessing/bounding layer for GOA/GLOA;
  • or refresh the MC++ interface (build system, newer MC++ releases, subgradient options);
  • or standardize on in-tree pieces (contrib.fbbt, contrib.alternative_solutions.obbt).

Also the natural home for the B8 per-disjunct convexification machinery.

Part of roadmap epic #2 (item C3).

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