chore(Core/Probability/Choice): drop dead PMF.uniformOfArgmax layer - #1715
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Deletes
Choice/Argmax.lean:PMF.uniformOfArgmaxhas zero uses, and the consumer its docstring promises (Franke 2011 IBR) is structurally unreachable — IBR's best response is exact-ℚ (bestResponse : T → M → ℚ, already wired toFinset.argmaxviaoptimalMessages_eq_argmax), while the PMF layer is noncomputable ℝ≥0∞.Core/Order/Argmax.lean(the layer actually consumed, 3 importers) is untouched; if the PMF wrapper is ever wanted it belongs upstream in mathlib'sProbability/Distributions/Uniform.lean, after aFinset.argmaxset-op lands inData/Finset/Max.lean.