feat: prove T226, US implies T₁ - #1341
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T226: a US space is T₁.If
x ⤳ y, the sequence constant atxconverges toy— that is what specialization says,in the form
pure x ≤ 𝓝 y— and it converges toxas well. Uniqueness of sequential limitsforces
x = y, which is T₁.Closes #481.