Move the wire protocol into agent-core and announce protocol 2 in serve

Author: gaoyu06

crates/agent-core/src/core.rs

@@ -278,6 +278,14 @@ impl AgentCore {
         self
     }
 
+    pub fn session_id(&self) -> &str {
+        self.session.session_id()
+    }
+
+    pub fn cwd(&self) -> &std::path::Path {
+        &self.cwd
+    }
+
     pub fn startup_events(&self) -> Vec<AgentEvent> {
         let model_config = self.config.current_model_config();
         let mut events = vec![

crates/agent-core/src/lib.rs

@@ -11,6 +11,7 @@ pub mod logging;
 mod mcp;
 mod oauth;
 mod prompt;
+pub mod protocol;
 mod providers;
 mod secrets;
 mod session;