Night Drive v2: pure synthesis, washed Collins drums, drive pulse, POV footage

Engine additions (all surfaced in the builder, all render-tested):

• bass pattern "drive": straight 8ths on the root — the pulse that never lifts

• transition "tom fill": four-beat halves->quarters->crescendo roll

• instruments.drums.send: drum reverb send (snare full, kick/hat scaled); default 0.18 preserves every existing render

• Synthwave preset rework from feedback (less reedy / bigger reverbed drums / more driving / big fills / more night drives): saw lead instead of square, bigger detuned saw pads, found-sound bed pulled to 0.12…

▶ Play it: Highway Heat Death — parked on the genre this change names https://stellate.app/?genre=synthwave&seed=1147&path=859.9909,878.9942,840.9942&xdur=13.122

9286c27 https://github.com/aboard-io/stellate/commit/9286c27bf56bae1a48f98a65090b5b677e1e41bb