nx_print_loop_e2e_test.nx

nx_print_loop_e2e_test.nx -- end-to-end substrate loop: simulated telemetry -> pump -> verdict -> response wire bytes. Proves the full substrate-level closure: telemetry_event (simulated; in prod from Moonraker JSON) | v nx_runtime_monitor_pump_telemetry() (input side, shipped) | v issue verdict (NX_RT_ISSUE_*) | v nx_print_build_response_for_issue() (output side, shipped) | v HTTP POST bytes ready for nx_mr_post_ipv4 (network shipped) Three scenarios per simulated print: A. Quiet tick (no issue) -> dispatcher returns 0 bytes B. PAUSE-class issue (BED_TEMP_DROP) -> wire bytes contain "POST /printer/print/pause" C. HARD_STOP issue (LAYER_SHIFT) -> wire bytes contain "POST /printer/print/cancel" expect_exit: 0 license_tier: ORIGINAL