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Docker's _connect_nio and adapter_update_nio_binding applied packet filters but never called _ubridge_apply_markers, so markers silently did nothing on Docker links despite docker being in the allowlist. Add the missing calls (same pattern as the IOU fix). Also narrow _MARKER_CAPABLE_TYPES to the four types that actually implement marker support — vpcs, qemu, docker, iou — removing dynamips, virtualbox, vmware, and cloud which have no marker pathway and would silently fail when selected as the capture side.