ObjectManager.jets holds scene-level Jets. build_compact_lists_for
collects true FP64 hits (SimObject.get_curved_list hits_out) row-aligned
with the cut-link columns; BodySyncPlan carries them as curved_hits, and
sync_to_gpu / apply_sync_plan / the pre-sync check pass jets+hits to
assign_surface. Jets require D2Q9/FP32/unshifted/double_buffer and may
only drive links of stationary bodies. Simulation.add_jet (before
initialize) and set_jet_amplitude (velocity column re-upload only);
save_checkpoint refuses scenes with jets. Fine-path wiring not included.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
