PERF: Speed up permutation cluster tests via Numba union-find + compact graph#13731

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sharifhsn wants to merge 10 commits intomne-tools:mainfrom

sharifhsn:perf-opt

Commits on Mar 10, 2026

PERF: Vectorize p-value computation via searchsorted

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PERF: Compact graph reindexing in _get_components

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PERF: Vectorize cluster sums via np.add.reduceat

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PERF: Vectorize sign-order generation via bit-shifting

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PERF: Precompute sum-of-squares for sign-flip t-test

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PERF: Numba union-find for spatio-temporal cluster labeling

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PERF: Extract _union helper, simplify _sum_cluster_data, trim comments

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FIX: Fix step-down reshape when adjacency is False

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DOC: Add changelog entries for PR #13731

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TST: Patch has_numba in numba_conditional fixture

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