fix: Broken doctest and test in CI

Author: benbrandt

.github/workflows/ci.yml

@@ -55,4 +55,6 @@ jobs:
         run: cargo build --all-targets --all-features
 
       - name: Run tests
-        run: cargo test --all-features
+        run: |
+          cargo test --all-features
+          cargo test --all-features --doc

rust/acp.rs

@@ -84,10 +84,10 @@ use std::sync::Arc;
 /// # Example
 ///
 /// ```
-/// use agent_client_protocol::SessionId;
+/// use agent_client_protocol_schema::SessionId;
 /// use std::sync::Arc;
 ///
-/// let session_id = SessionId(Arc::from("sess_abc123def456"));
+/// let session_id = SessionId::new("sess_abc123def456");
 /// ```
 ///
 /// See protocol docs: [Session ID](https://agentclientprotocol.com/protocol/session-setup#session-id)