russell@unturf.com 4960381c67 portal-rng: add (random-seed-from-os!) across all three tiers ...

Ticket 0002 — reads 8 bytes from /dev/urandom (little-endian u64) and
seeds xoshiro256**. Opt-in kernel entropy for stochastic runs; the
default stays deterministic (k=0 at startup), so ticket 0001's
portal-reproducibility contract is unchanged.

Real-world flow now one call away:
  Machine A: (random-seed-from-os!) + run simulation + portal-save
  Machine B: portal-resume — same stream, bit-for-bit

All three impls fail loud on /dev/urandom trouble (LispErr in Python
and C, stderr + exit(1) in asm) — no silent fallback to a weak seed.

Tests:
- tests/functional.lsp: 2 new shared asserts (entropic + replay)
- asm/test.sh: 2 new asm-local checks (149 total, was 147)
- make test-all green across Python (205), C (205), asm (149)

Whitepaper §7.5 gains one sentence noting the OS-seed path.
unmoad: zero new findings in added code.

2026-04-20 15:50:26 -04:00

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