[wgordon17]

Summary

• Replaces per-character random() draws with single-draw getrandbits(k) MSB fixed-point scaling (< 2^-64 relative bias per NIST SP 800-90A §B.5.1.1, immune to weak low bits) and narrows Cuid.generate()'s state.lock critical section (5.10x faster single-thread generate(), 5.54 µs vs 28.23 µs; 9.52x faster 4-thread shared create_id() and 15.19x faster 8-thread per-thread Cuid().generate() on Python 3.14t)
• Encodes only the leading resolved_length + 1 base36 digits of 99- and 100-digit SHA3-512 digests via utils._create_hash_slice while preserving 100% output equivalence with utils.create_hash
• Defers inspect and socket imports, switches SystemRandom import from secrets to random, and uses compile-time alphabet literals with local loop bindings (44.7% faster cold import cuid2, 4.86 ms vs 8.79 ms)