feat: complete wgcloak v1 transports

fuzz/fuzz_targets/fuzz_tls_frame.rs

@@ -0,0 +1,24 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use wgcloak::transport::tls_tcp::FrameCodec;
+
+const MAX_INPUT: usize = 64 * 1024;
+const MAX_FRAME: usize = 16 * 1024;
+const CHUNK: usize = 97;
+
+fuzz_target!(|input: &[u8]| {
+    let input = &input[..input.len().min(MAX_INPUT)];
+    let Ok(mut codec) = FrameCodec::new(MAX_FRAME) else {
+        return;
+    };
+
+    // Feed deliberately uneven chunks so header/payload state transitions are
+    // exercised independently of TCP read boundaries.
+    for chunk in input.chunks(CHUNK) {
+        if codec.feed(chunk).is_err() {
+            break;
+        }
+    }
+    let _ = codec.finish();
+});