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Refactor/bernoulli subadditivity - #76
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`han_inequality` proved Ent(h²) ≤ ∑ⱼ E[twoPointEntropyCoord j h] on the hypercube by a dedicated induction, but this is a special case of `SubAddEnt.entropy_subadditive`: `bernoulliUniform n` is a product of uniform measures on `Bool`, and the conditional entropy of `h²` along coordinate `j` is the two-point entropy. - Add `boolUniform`, `bernoulliUniform_eq_pi`, and `condEntExceptCoord_sq_eq_twoPointEntropyCoord`. - Prove `entropy_le_half_gradient` from `SubAddEnt.entropy_subadditive`. - Remove `han_inequality` and the lemmas used only by its proof. - Remove seven unused lemmas matching the induction-on-n approach in the module docstring (e.g. `gradient_term_symmetric`, whose statement is closed by `rfl`). The statements of `bernoulli_logSobolev`, `entropy_le_half_gradient` and `bernoulli_logSobolev_app` are unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Part of #71. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…badditivity # Conflicts: # StatsMLlib/Probability/Concentration/LogSobolev/Bernoulli.lean
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