fix: resolve KeyExchange import error and clean compiler warnings

- Removed stale KeyExchange re-export from crypto/mod.rs (kex.rs
  only exports HybridSharedSecret and HybridKex after stub refactor)
- Removed unused imports in ostp-server/lib.rs (AsyncWriteExt,
  tcp::OwnedWriteHalf)
- Suppressed dead_code warning on HelperMsg::Log variant (IPC spec)
- Verified: cargo check passes with zero errors and zero warnings

Cargo.lock

@@ -745,7 +745,7 @@ checksum = "c08d65885ee38876c4f86fa503fb49d7b507c2b62552df7c70b2fce627e06381"
 
 [[package]]
 name = "ostp"
-version = "0.1.58"
+version = "0.1.60"
 dependencies = [
  "anyhow",
  "base64",
@@ -762,7 +762,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-client"
-version = "0.1.58"
+version = "0.1.60"
 dependencies = [
  "anyhow",
  "bytes",
@@ -780,7 +780,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-core"
-version = "0.1.58"
+version = "0.1.60"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -813,7 +813,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-server"
-version = "0.1.58"
+version = "0.1.60"
 dependencies = [
  "anyhow",
  "bytes",
@@ -828,7 +828,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-tun-helper"
-version = "0.1.58"
+version = "0.1.60"
 dependencies = [
  "anyhow",
  "chrono",

ostp-core/src/crypto/mod.rs

@@ -4,6 +4,6 @@ pub mod noise;
 pub mod obfuscation;
 
 pub use aead::SessionCipher;
-pub use kex::{HybridSharedSecret, KeyExchange};
+pub use kex::{HybridSharedSecret, HybridKex};
 pub use noise::{NoiseRole, NoiseSession};
 pub use obfuscation::{deobfuscate_header_inplace, deobfuscate_packet_inplace, obfuscate_packet_inplace, derive_obfuscation_key, derive_psk};

ostp-server/src/lib.rs

@@ -10,8 +10,8 @@ use dispatcher::{DispatchOutcome, Dispatcher};
 use ostp_core::relay::RelayMessage;
 use ostp_core::{NoiseRole, PaddingStrategy, ProtocolConfig};
 use signal::wait_for_shutdown_signal;
-use tokio::io::{AsyncReadExt, AsyncWriteExt};
-use tokio::net::{tcp::OwnedWriteHalf, TcpStream, UdpSocket};
+use tokio::io::AsyncReadExt;
+use tokio::net::{TcpStream, UdpSocket};
 use tokio::sync::mpsc;
 use tokio::time::{interval, Duration, Instant};
 

ostp-tun-helper/src/main.rs

@@ -29,6 +29,7 @@ enum GuiCmd {
 
 #[derive(Serialize)]
 #[serde(tag = "type", rename_all = "lowercase")]
+#[allow(dead_code)]
 enum HelperMsg {
     Status { value: u8 },
     Log { message: String },