nx_websocket_frame_test.nx

nx_websocket_frame_test.nx -- KAT for nx_websocket_frame. Audits the existing 255-LOC frame codec. The module shipped with inline main() assertions but no formal test + smoke wrapper, so any latent bug would be silent (same class as the nx_sort_insertion canonical-without-KAT bug closed 2026-05-20). This test promotes the ad-hoc main() invariants to a regression gate AND adds the RFC 6455 §5.7-style canonical wire vectors that prove browser-compatibility. Test vectors (RFC 6455 §5.7): T1 Single-frame unmasked text "Hello": 0x81 0x05 H e l l o T2 Single-frame masked client text "Hello" with key 0x37FA213D T3 Single binary unmasked with payload_len 126 (extended 16-bit) T4 Single binary unmasked with payload_len 65536 (extended 64-bit) T5 Ping/pong/close opcodes round-trip through parse+build T6 Self-inverse mask XOR (mask twice = identity) expect_exit: 0 license_tier: ORIGINAL