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58b97b4ce5
update_suspend() piggybacks on the filter system: get_active_filters()
returns {"frequency_drop": [-1]} while a link is suspended so relay-based
node types drop all traffic at the uBridge filter. Kernel-datapath links
implement suspend natively via interface carrier, and pushing the
synthetic filter tripped the compute-side guard, making suspend fail
with 409 on every kernel link (and leaving controller/kernel state torn).
_get_node_filters() now returns empty filters for kernel links.