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perf(#178): D18 block exponential action with deterministic multi-RHS bound - #182

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gpt56/issue178-d18-block-action
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marcohost33-maker wants to merge 8 commits into
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gpt56/issue178-d18-block-action

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Implements item 1 of #178 only. d<8 preserves the historical dense D18 path exactly. For n=d^2>=64, the Haar ensemble is generated in the same RNG order and propagated as one expm_multiply block. The condition-(3.13) substep threshold is divided by n_rhs so SciPy remains on its deterministic exact-norm path and does not consume global np.random. LepResult records initial_state_backend additively. New tests cross-check the block result against dense D18 and pin global RNG invariance. Resolvent/non-normality methodology remains out of scope.

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