Separate observed lithosyntrophy from proposed intracellular energy mechanism #1697

CommunityMech:000290; PMID41811448. Preserve three nodes and both H2-to-methanogenesis arrows. Qualify HndABCD/Rnf mechanism as metaproteomic/thermodynamic model, not direct enzyme causality. Correct methanogenic sink actor direction. Net phosphite oxidation remains exergonic; excess H2 inhibits the intracellular energy-conserving process. Preserve BES inhibition, H2 inhibition and G11 rescue as primary-positive evidence without universal Methanoculleus exclusivity. Close only after protected-main merge.

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