net-cat 0.3.0

Minimal hand-rolled HTTP/1.1 client over std::net::TcpStream. v0.3.0 adds chunked-transfer decoding (`Transfer-Encoding: chunked` responses now yield the correct decoded body) and a redirect follower in `fetch` (RFC 7231 §6.4: 301/302/303 downgrade non-GET/HEAD to GET and drop the body; 307/308 preserve method + body; cross-origin hops strip `Cookie` and `Authorization`; capped at `MAX_REDIRECTS = 10` hops). Optional `tls` feature still wires rustls + webpki-roots for `https://` URLs. No external HTTP crate. Sixth sub-crate of a Servo-replacement webview runtime targeting Tauri.