Rework radar system

data_acq_and_processing/processing/locator/include/locator/tcp_server.hpp

@@ -36,7 +36,6 @@ class ClientQueue {
     // Wake any waiter and reject further pushes. Idempotent.
     void close();
 
-    [[nodiscard]] auto is_closed() const -> bool;
 
   private:
     mutable std::mutex mutex_{};

data_acq_and_processing/processing/locator/src/tcp_server.cpp

@@ -197,11 +197,6 @@ void ClientQueue::close() {
     not_empty_.notify_all();
 }
 
-auto ClientQueue::is_closed() const -> bool {
-    std::lock_guard<std::mutex> guard(mutex_);
-    return closed_;
-}
-
 // ----- ClientSession --------------------------------------------------------
 
 ClientSession::ClientSession(