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fix(bigint): fix modpow normalization for modulus=1 and negative bases

Initialize result as 1%modulus (not 1) so modulus=1 returns 0. Normalize
base into [0, modulus) before the loop so negative bases produce
canonical non-negative results. Applied to both native and JS backends.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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