Apply 416.1163(e)(2) to deemed SSI and identify SSI couples by marriage, not tax roles

changelog.d/ssi-couples-and-deeming-cap.fixed.md

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+SSI under spousal income deeming is now the lesser of the couple computation and the individual Federal benefit rate less the person's own countable income (20 CFR 416.1163(e)(2)), not the couple computation capped at the individual rate; uncapped_ssi applies the same rule, so state supplements that read it see the federal shortfall. SSI couples are now identified by the co-resident spouse test that resource deeming uses rather than by tax-unit head and spouse roles, for joint claims, combined couple income and resources, and income deeming from an ineligible spouse (416.1801(c), 416.1806, 416.1160(d)). State supplement couple rates, income, resources, care categories and spouse allowances now use only the actual spouses when a situation omits marital units and includes a third adult. Colorado OAP retains declared spouses living apart; Missouri retains their combined resources for medical separation, Virginia and South Dakota retain joint care-entry budgets, and Oregon retains the community-care spouse payment across facilities. Iowa pools only the identified spouses across its state supplement paths, retains its prior-SSI residential-care entry budget across facilities, and requires an explicit shared-room input for the same-month entry rule without prior SSI.