ACP champagne (#35609)

cherry pick changes from #35510 onto latest main

Release Notes:

- N/A

---------

Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Lukas Wirth <lukas@zed.dev>

crates/agent2/src/native_agent_server.rs

@@ -0,0 +1,58 @@
+use std::path::Path;
+use std::rc::Rc;
+
+use agent_servers::AgentServer;
+use anyhow::Result;
+use gpui::{App, AppContext, Entity, Task};
+use project::Project;
+
+use crate::{templates::Templates, NativeAgent, NativeAgentConnection};
+
+#[derive(Clone)]
+pub struct NativeAgentServer;
+
+impl AgentServer for NativeAgentServer {
+    fn name(&self) -> &'static str {
+        "Native Agent"
+    }
+
+    fn empty_state_headline(&self) -> &'static str {
+        "Native Agent"
+    }
+
+    fn empty_state_message(&self) -> &'static str {
+        "How can I help you today?"
+    }
+
+    fn logo(&self) -> ui::IconName {
+        // Using the ZedAssistant icon as it's the native built-in agent
+        ui::IconName::ZedAssistant
+    }
+
+    fn connect(
+        &self,
+        _root_dir: &Path,
+        _project: &Entity<Project>,
+        cx: &mut App,
+    ) -> Task<Result<Rc<dyn acp_thread::AgentConnection>>> {
+        log::info!(
+            "NativeAgentServer::connect called for path: {:?}",
+            _root_dir
+        );
+        cx.spawn(async move |cx| {
+            log::debug!("Creating templates for native agent");
+            // Create templates (you might want to load these from files or resources)
+            let templates = Templates::new();
+
+            // Create the native agent
+            log::debug!("Creating native agent entity");
+            let agent = cx.update(|cx| cx.new(|_| NativeAgent::new(templates)))?;
+
+            // Create the connection wrapper
+            let connection = NativeAgentConnection(agent);
+            log::info!("NativeAgentServer connection established successfully");
+
+            Ok(Rc::new(connection) as Rc<dyn acp_thread::AgentConnection>)
+        })
+    }
+}