stormgen.js: envelopes are authored data (every knob a range, knot times
fixed), a seed picks one storm via a single mulberry32 stream in a pinned
draw order. Same seed → byte-equal def; def carries its seed so the gust
timeline downstream is seeded by the same number. checkEnvelope() recomputes
membership FROM THE DEF (never trusts the generator) and also runs the storm
validator. One family ships: soaker_family, ranged around storm_06's measured
personality. Cases ride the shared node+browser list: byte-equal determinism,
100 seeds all valid + all inside (gustPeak spread 12.8-17.2 across seeds),
four named escape routes red-not-shrugged, valid-but-off-family storm red
(checkEnvelope is not the validator in a hat), change event === physics for
sampled seeds, and two fixed-seed generated storms ride the SAME telegraph/
continuity/validator gates as authored ones. Node suite 72/0. Mutation check:
rng → Math.random went red on the byte-equal case, restored, green.
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