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fix(bigint): fix bit_length for negative multi-limb powers of two

The power-of-two check started with limbs[0].popcnt()==1, which fails
for numbers like -2^32 where limb 0 is 0 and limb 1 is 1. Fixed to
count total set bits across all limbs.

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

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