feat(test-rng): deterministic_rng(seed) helper (#344)#381
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Per rules/global_rules.md §Numerical Discipline, Monte-Carlo and simulation tests must seed deterministically. Introduce `utils::others::deterministic_rng(seed: u64) -> StdRng` plus a `DETERMINISTIC_RNG_DEFAULT_SEED` constant so test authors have one obvious, documented entry point for reproducible sample streams. The helper is re-exported from `utils::` and covered by three unit tests: same seed → identical stream, different seeds diverge, default seed is stable across calls. This PR adds the primitive; the follow-up threading work (removing `rand::random()` and `thread_rng()` from existing tests) is tracked per-module on top of this helper. Closes #344
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Summary
Closes #344.
Test plan