MEDYAN.fila_tip_snapshotTuple{MEDYAN.Context, MEDYAN.FilaTipIdx}Return the snapshotted tip position for the given filament tip.
Tip positions are set from the actual tip position at the end of minimize_energy! and baoab! (whenever load forces are updated). Before the first mechanics cycle, positions are NaN.
These snapshotted positions are used by fila_tip_cutoff reactions to count nearby tips.