M6 — Uniform batch (v1 cut line)

Definition of done (PLAN.md §5): Strided/3-D arrays, ubatch_size/index/mask, per-member info/stats, nrhs > 1 at any batch size, generic API auto-detect, strided-batched vendor calls on root fronts. MadNLP two-stage Schur KKT and ExaModels multi-scenario models run on it.

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