fix rustdoc warnings on transport links

- Re-export TransportHandle / TransportReader / TransportWriter alongside
  SubprocessTransport. Without these in the public API, rustdoc refused
  to resolve [`TransportHandle::close`] from SubprocessTransport's docs.
- Inline the close()/end_input() link prose where the broken-link
  warning fired.

cargo doc --no-deps now builds clean.

src/lib.rs

@@ -125,7 +125,7 @@ pub use messages::{
 };
 pub use options::{ClaudeAgentOptions, Effort, McpServersConfig, PermissionMode, SystemPrompt};
 pub use query::query;
-pub use transport::SubprocessTransport;
+pub use transport::{SubprocessTransport, TransportHandle, TransportReader, TransportWriter};
 
 /// Crate version, as set in `Cargo.toml`. Sent to the CLI as
 /// `CLAUDE_AGENT_SDK_VERSION` in the subprocess env.

src/transport.rs

@@ -53,14 +53,13 @@ const MINIMUM_CLAUDE_CODE_VERSION: (u32, u32, u32) = (2, 0, 0);
 ///
 /// The reader half is consumed by the message-pump task; the writer half is
 /// cloned freely (`Arc<Mutex<…>>`-backed) and used to push user-message
-/// frames. The handle is what you call [`close`] on to wait for the
+/// frames. Call [`TransportHandle::close`] on the handle to wait for the
 /// subprocess to exit.
 ///
-/// Drop implements best-effort `start_kill()` on the child so an abandoned
-/// transport doesn't leak a `claude` process.
+/// Drop on the handle implements best-effort `start_kill()` on the child so
+/// an abandoned transport doesn't leak a `claude` process.
 ///
 /// [`connect`]: SubprocessTransport::connect
-/// [`close`]: TransportHandle::close
 pub struct SubprocessTransport {
     options: ClaudeAgentOptions,
     cli_path: PathBuf,
@@ -301,7 +300,7 @@ impl TransportWriter {
         guard.take(); // drop ChildStdin → close write end
     }
 
-    /// True if stdin has already been closed via [`end_input`] or the
+    /// True if stdin has already been closed via [`Self::end_input`] or the
     /// underlying handle was dropped.
     pub async fn is_closed(&self) -> bool {
         self.inner.stdin.lock().await.is_none()