refactor(Phonology/Autosegmental): retype tiers to LabeledTuple#749
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Retype autosegmental tiers
List→LabeledTuple, introducing two reusable Core keystones and deleting ~150 lines of bespokeFin-plumbing fromAR.[UPSTREAM]keystones:Core/CategoryTheory/Monoidal/LabeledTuple(the cocartesian monoidal category of finite labeled tuples, viamonoidalOfHasFiniteCoproducts) andCore/Data/Fin/Tuple/Basic(Fin.appendMap, the action of+on index maps).AR.Hom's tier maps becomeLabeledTuple.Hom(label preservation bundled) andconcatMapdelegates to the keystone; links stayFinset (ℕ×ℕ)so the monoid/monoidal laws stay HEq-free.decideproofs preserved and clean-build re-validated.