feat: implement seedable RNG system #5 #10
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Add seedable random number generator for deterministic dice rolling: - RNG interface with next() and nextInt(min, max) methods - SeededRNG class using xorshift128 algorithm with splitmix32 seeding - MockRNG factory for deterministic testing (throws on exhaustion) - Comprehensive test suite (45 tests) covering: - Reproducibility with string/number seeds - Edge cases: negative, float, NaN, Infinity, unicode seeds - Distribution uniformity for d6, d20, d100 - Bounds validation (10K+ iterations) - Sequence consistency Key features: - Unbiased distribution via rejection sampling - nextInt(min, max) returns inclusive bounds [min, max] - MockRNG never wraps - catches incorrect roll counts in tests
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Add seedable random number generator for deterministic dice rolling:
Key features: