nx_moonraker_io_test.nx

nx_moonraker_io_test.nx -- REAL network roundtrip test. Parent: acts as a fake Moonraker server -- listens on a loopback port, accepts the connection, reads the POST request, validates it contains expected markers, sends back a canned HTTP/1.1 200 OK response. Child: builds + sends the Moonraker POST /printer/print/start request via nx_mr_post_loopback (composes nx_mr_build_post_request + tcp_connect_loopback + sys_write + sys_read). Verifies the response status is 200. Exits with assertion code. Bytes flow over a real loopback socket through the real Linux kernel TCP stack inside qemu -- this is REAL network I/O, not a mock. expect_exit: 0 license_tier: ORIGINAL