feat(Morphology): MorphFeatures meet, unify laws; scope Caha order#124
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Completes the audited PR-B scope for the feature-bundle lattice.
SemilatticeInf UD.MorphFeatures— the meet is Shieber's generalization (total, unlike the join);Compatible := BddAbove {f, g}with decidability off the Bool check;unify_eq_some_iff_isLUB,unify_assoc,unify_bot,unify_eq_none_iff, guardedunify_mono(unguarded monotonicity is false).Word.Agree.not_transitivemachine-checked (she/they/he) + reflex-wildcard witness; theory-neutrality and tradition-placement boundaries stated in the module docstring.Syntax/Case/Order.lean's globalPartialOrder Caseto scopedSyntax.Case.Caha— features bear theoretical orders as opt-in commitments;Caha2009/Bubnov2026opt in.