nx_room_stream_gate.nx

nx_room_stream_gate.nx -- T4: proves the SOVEREIGN no-WebSocket media down-channel. Composes nx_room_stream (HTTP/1.1 chunked transfer wire) + nx_video_client_wasm (vc_wire room-frame format the browser client core packs/parses). Proves: 1) raw payloads round-trip byte-exact through chunked encode->decode (1- & multi-digit hex) 2) terminator chunk (len 0) ends the stream 3) malformed chunk length is REJECTED (neg-control = no false-green) 4) a real vc_wire media frame survives the chunked stream, kind/seq/payload byte-exact All built nx_cc_sovereign -> nxasm_x86 (no gcc, no .sh, no WebSocket, no WebRTC). license_tier: ORIGINAL