Each dimension of a parametric param renders as a CurveEditor in the
inspector (bezier handles map to the Hermite slopes of the host curve
model; edits serialize back through the JSON mirror — undoable and
project-persisted). The engine re-sync skips in-progress drags and
identical curves so the per-render sync neither steals gestures nor
loops. Also: physical-memory probe for the worker-count policy on
Windows (GlobalMemoryStatusEx).