Dev surface / starfield pass
The current home stars, moving.
This keeps the existing Nightshift home background intact and tests only the motion layer: slow vertical drift, faint tracer reads, and a brief spin pulse every cycle.
Timing
Mostly slow, then a short impulse
The existing star gradient drifts vertically on a long loop, then briefly tilts before settling back into the normal crawl.
Read
Tracer motion stays under the UI
The streaks are low-opacity and delayed across the screen so the effect reads as atmospheric movement instead of foreground noise.