Fix unsound rand rustsec 2026 0097#831
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Upgrade rand 0.8 → 0.9 (mitigates RUSTSEC-2026-0097)
Bumps rand from 0.8.5 to 0.9.4 to resolve the advisory flagged in the previous commit. Adapts all call sites to the breaking API changes in rand 0.9.
API changes
rand::distributions::Open01rand::distr::Open01SeedableRng::from_entropy()SeedableRng::from_os_rng()rand::rngs::mock::StepRngMockRng(see below)from_os_rng() requires the os_rng feature in rand_core, exposed as rand's own os_rng feature — added to statime-linux's dependency.
MockRng
rand::rngs::mock::StepRng was deprecated in 0.9 without replacement. Rather than suppress the warning, a minimal MockRng(u64) implementing RngCore is added to the test module. The RNG is only used to produce timing jitter in delay
requests, so the specific values don't affect test correctness.
Test results
74 unit tests + 13 doctests pass with no warnings.