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078cf92aef
The per-definition fan-out applied markers to links in a serial loop -- one compute round-trip per link. On a 1000-link project that serializes N HTTP round-trips (minutes on remote computes). Fan out with asyncio.gather + Semaphore(32): links are independent (own _markers/_link_data), per-link ControllerError stays isolated, and Project.dump is synchronous + atomic (tmp + rename) so concurrent dumps cannot corrupt the topology file. Converts the definition-create fan-out, the definition-update sync and re-fan-out loops, and the definition-delete cleanup to the shared _marker_apply_concurrently helper. apply_defs_to_new_link stays serial deliberately: all definitions share one link and each push carries the link's full marker set, so concurrent pushes would race and lose markers.