_ubridge_set_marker_filter_state raised "Marker X is not installed on this
node" when the capture node wasn't running — the name->bridge map is only
populated during _ubridge_apply_markers, which runs when the node is up. The
error was noise: the controller's enabled-only short-circuit catches it and
falls back, and the controller-layer enabled is authoritative (honoured when
the node starts and applies the marker). Treat a missing entry as a no-op
instead of raising.
0afbb897a5