nx_transport.nx

nx_transport.nx -- SOVEREIGN transport CONTRACT + loopback reference impl (operator 2026-07-04: "we wont have websocket ... built from the hardware rung up"). A TRANSPORT moves opaque wire FRAMES between endpoints. The core PRODUCES/CONSUMES frames (vc_wire_pack/parse, FEC, sequencing); the transport only MOVES bytes. The browser adapter satisfies this contract with WebSocket; the NishiOS adapter satisfies it with the sovereign datagram/QUIC leg (task #15). Nothing above the transport names WebSocket -> swap the impl, everything else is unchanged. Reliability/ordering VARY by impl (WS = reliable-ordered, datagram = best-effort); the core's jitter-buffer / NACK / FEC rungs provide the reliability layer ABOVE this best-effort mover -- so the CONTRACT is only "move a frame, in order, intact, or drop it". This reference impl is a bounded FIFO ring in a FLAT memory region (WAT-safe: no struct -> compiles to wasm for the browser adapter's buffer AND native for the NishiOS queue, from one source). Layout: header i64[4] @ byte 0 : [0]=closed [1]=head [2]=tail [3]=count frame slots @ byte TP_HDR : slot i = [len:i64][bytes:TP_FRAME_CAP], stride TP_SLOT license_tier: ORIGINAL