feat(Semantics/Dynamic/DRS): model-theoretic DRS core (K&R 1993)#45
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Faithful Lean model of Kamp & Reyle (1993) discourse representation structures, built on mathlib
FirstOrder.Language, with the §1.5 DRT→FOL reduction proven.Defs/Basic/Semantics: the DRS data type, subordination/accessibility (Relation.TransGen),IsProper, functorialmap, the merge monoid, and verifying-embedding truth (Realize/trueIn) over aStructure.Reduction:toFormulaintoL.Formula, andrealize_toFormulaproving a DRS's bespoke truth coincides with its first-order translation'sRealize.