fix socket permissions and ipc cleanup bug

- daemon: chmod socket to 0770 after bind so group devs can connect
- ipc: remove stale-socket deletion — it was deleting the socket when
  connect failed due to permissions, breaking the running daemon

src/daemon.rs

@@ -79,6 +79,7 @@ pub fn run(config_path: String) {
             return;
         }
     };
+    let _ = fs::set_permissions(&sock_path, fs::Permissions::from_mode(0o770));
     listener.set_nonblocking(true).ok();
 
     let mut procs: HashMap<String, Proc> = HashMap::new();

src/ipc.rs

@@ -4,12 +4,6 @@ use std::os::unix::net::UnixStream;
 pub fn send_cmd(cmd: &str) -> Result<Vec<String>, String> {
     let path = crate::state::socket_path();
 
-    if path.exists() {
-        if UnixStream::connect(&path).is_err() {
-            let _ = std::fs::remove_file(&path);
-        }
-    }
-
     let mut stream = UnixStream::connect(&path).map_err(|e| format!("daemon not running: {}", e))?;
     writeln!(stream, "{}", cmd).map_err(|e| format!("write: {}", e))?;
     stream.flush().map_err(|e| format!("flush: {}", e))?;