nx_moonraker_io.nx

nx_moonraker_io.nx -- network roundtrip layer for nx_moonraker_client. v2 of the Moonraker client arc: composes the v1 request builders (URL / JSON / POST/GET byte assembly) with real socket I/O so we can actually talk to a Klipper printer over the LAN. Loopback-only for this primitive (composes tcp_connect_loopback from nx_tls13_io for testability via fork-based smoke). An operator-facing variant accepting arbitrary sockaddr_in is queued as v3 -- trivial extension once loopback is proven. Composition map: nx_moonraker_client -- request builders (v1) nx_tls13_io -- tcp_connect_loopback (loopback helper) nx_syscalls -- sys_write / sys_read / sys_close Per cardinal feedback-engineering-sciences-bits-up-3d-print-first: this primitive demonstrates that the substrate already has every piece needed to talk to networked engineering tools (printers, CNCs, robotics controllers) -- the operator-side workflow is just composition of shipped primitives. Per cardinal feedback-real-playtest-loop-not-just-logs: the smoke uses fork() with a real fake Moonraker server in the parent and our real client in the child. Bytes flow over a real loopback socket through the real Linux kernel TCP stack in qemu. license_tier: ORIGINAL