feat(DDM): add choose operator elaboration support#1409
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Extends the DDM state-machine elaborator with `choose` keyword handling, supporting uninterpreted function declarations paired with axioms in 3-forall form. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
StrataDDM/Elab.lean) withchoosekeyword handling.) forchoose/εexpressions, mirroring existing quantifier syntax.and::separators;::still works as beforeNotes
This is the Strata-side half of the
choosefeature. The Strata-Boole half (grammar rulecommand_choosefndef, lowering logic, and tests) is in strata-org/Strata-Boole#pr/choose-operator and depends on this landing first.