Default cap on concurrent inbound peer-sync transfers the propagation node
accepts before replying ERROR_THROTTLED (Python LXMRouter .MAX_INBOUND_SYNCS). This is the node-side admission control that bounds
how much ingest work (and buffer) the node carries at once; the throttled
peer postpones its next sync by PN_STAMP_THROTTLE_SECS.
Default cap on concurrent inbound peer-sync transfers the propagation node accepts before replying
ERROR_THROTTLED(PythonLXMRouter .MAX_INBOUND_SYNCS). This is the node-side admission control that bounds how much ingest work (and buffer) the node carries at once; the throttled peer postpones its next sync by PN_STAMP_THROTTLE_SECS.