FlowField (ServerShared) is the flow law; Zone.Flow/FlowScroll read PlanetSettings.Flow at zone
time. The Flow block moves from DefaultEnvironment to PlanetSettings (ZoneEnvironment key 1 is
retired), VolumeSampling's frame-clock scroll accumulator and the Stardust leftover field are
deleted, and slopeFlow returns 0 for a zero gradient. Unity parity probe follows in the next
commit; this commit has not been built in Unity.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
