refactor: consolidate nvim crates, extract server library, and update workspace dependencies

nvim-core/src/headless.rs

@@ -57,3 +57,18 @@ pub async fn kill_headless_nvim() {
         let _ = child.kill().await;
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn test_headless_nvim_lifecycle() {
+        let res = spawn_headless_nvim().await;
+        if let Ok(socket_name) = res {
+            assert!(socket_name.contains("agy-headless-nvim"));
+            kill_headless_nvim().await;
+        }
+    }
+}
+