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User-reported: 2026-08-24 Vespers (St. Bartholomew, Duplex II. classis, keeps his own evening) should have commemorated 2026-08-25's St. Louis (Simplex), but didn't. This was the exact untested asymmetry the old commemorationOf's own doc comment flagged as "inferred by symmetry, not independently live-verified." Live-verifying now shows the two directions genuinely differ: a Simplex predecessor losing to tomorrow's First Vespers is correctly excluded (Aug 7 Donatus case, "nihil de præcedenti"), but a Simplex successor displaced because today keeps its own Vespers IS still commemorated (Aug 24->25, "commemoratio de sequenti"). Split the one shared commemorationOf into commemorationOfDisplacedPredecessor (keeps the Simplex exclusion) and commemorationOfDisplacedSuccessor (drops it). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc