Every windchange event gets an in-world tell: a dark bank standing on the
horizon in the quarter the new wind comes FROM, rising across the 12 s
before the change and clearing after the swing, plus a low distant rumble
layer in the audio. Soft-edged via vertex alpha (the hard band read as a
floating rectangle on the bench). Deterministic off (dt, t): progress is a
pure function of t, azimuth comes from dirAt at a fixed post-change
instant. Night 2 teaches the tell at ~18 s; night 3 shows the same wall at
t=6, which is 'looks like night 2 and isn't' made visible.
dev_skyfx.html: the skyfx bench — one storm, bare ground, scrubbable
clock, so the tell can be judged by eye without playing to night 3.
Two new asserts in c.test.js (window, monotonic rise, direction, mesh
orientation, changeless storm stays clear, bit-exact determinism).
Selftest 322/0/0.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
