feat(Syntax/Minimalist): toNonplanar_mul, discharge merge-bridge coherence#744
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Prove
toNonplanar_mul: the carrier projection distributes over Merge with a canonical node label (leftmostLeafPlanarof the selection-induced embedding) and children{l.toNonplanar, r.toNonplanar}. The label is uniform; only the child-multiset orientation is case-dependent (Multiset.pair_comm). OnDom(h)the label is the genuine selector (toNonplanar_mul_selHead, via the agreement lemma).This is the externalize-respect coherence the
mergeOp_*_matches_Stepbridges took as an opaque tree-equation hypothesish_coh. Now discharged: the three bridges (emR/emL/im) instead take the simple, decidableselHead (… * …) = some Land proveh_cohinternally viatoNonplanar_mul_selHead. Axiom-clean (no sorry/native_decide). Spec:scratch/tonon-mul-spec.md.