The PRUNE ran unconditionally every 2s. With Ardour closed it deleted
SuperCollider's ONLY output links, and a linkless pipewire-jack client
self-drives its data loop into a 100%-CPU error spin at RT priority.
Hours of that starved the SOF DSP's IPC until the firmware wedged
(IPC timeout -110) and every sink vanished (2026-09-07). 'SC must
never reach hardware' is Ardour-session policy, not idle-laptop policy:
routing and pruning now both require Tidal tracks in the graph.