Merge branch 'fix/multithread-search-after-restore' into main-dev

Author: ashvardanian

include/usearch/index.hpp

@@ -1751,6 +1751,9 @@ class memory_mapped_file_t {
     {
     }
 
+    memory_mapped_file_t(memory_mapped_file_t const&) = delete;
+    memory_mapped_file_t& operator=(memory_mapped_file_t const&) = delete;
+
     memory_mapped_file_t(byte_t* data, std::size_t length) noexcept : ptr_(data), length_(length) {}
 
     memory_mapped_file_t& operator=(memory_mapped_file_t&& other) noexcept {

javascript/lib.cpp

@@ -388,7 +388,7 @@ Napi::Value exactSearch(Napi::CallbackInfo const& ctx) {
         return env.Null();
     }
 
-    executor_default_t executor(threads);
+    executor_default_t executor{threads};
     exact_search_t search;
 
     // Performing the exact search.