ok
0a1bdde25f
Non-standard but ubiquitous in gforth/SwiftForth/VFX. Adds a shared rng_state on ForthVM, seeded from nanosecond wall-clock at boot. `RANDOM ( -- u )` returns a 32-bit pseudo-random cell; `RND-SEED ( u -- )` reseeds, with 0 forced to a nonzero constant to avoid xorshift's fixed point. Three tests cover determinism after seeding, distinct-value spread across 1000 pulls, and the zero-seed safeguard.