builtins: add rndn normal-distribution sampler#180
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Doc cited every Monte Carlo program forced to bootstrap because rnd is uniform-int only. Added rndn mu sigma via Box-Muller (shared across all three engines for consistency). Each call consumes two fastrand f64 samples. Opcode 104.
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Doc cited every MC program forced to bootstrap because rnd is uniform-int only. Added
rndn mu sigmavia Box-Muller. Shared helper across tree/VM/JIT for consistency; each call consumes two fastrand f64 samples. Opcode 104. Statistical tests over N=1000 within 6.3 standard errors.