[socket] Rename fast_select_hook_fd -> hook_fd_for_fast_select

Disambiguates the verb-vs-noun parse of the original name. The new
form reads as 'hook this fd for the fast-select path', matching the
function's actual job.

esphome/components/socket/bsd_sockets_impl.cpp

@@ -14,7 +14,7 @@ BSDSocketImpl::BSDSocketImpl(int fd, bool monitor_loop) {
   if (!monitor_loop || this->fd_ < 0)
     return;
 #ifdef USE_LWIP_FAST_SELECT
-  this->cached_sock_ = fast_select_hook_fd(this->fd_);
+  this->cached_sock_ = hook_fd_for_fast_select(this->fd_);
 #else
   this->loop_monitored_ = App.register_socket_fd(this->fd_);
 #endif

esphome/components/socket/lwip_sockets_impl.cpp

@@ -14,7 +14,7 @@ LwIPSocketImpl::LwIPSocketImpl(int fd, bool monitor_loop) {
   if (!monitor_loop || this->fd_ < 0)
     return;
 #ifdef USE_LWIP_FAST_SELECT
-  this->cached_sock_ = fast_select_hook_fd(this->fd_);
+  this->cached_sock_ = hook_fd_for_fast_select(this->fd_);
 #else
   this->loop_monitored_ = App.register_socket_fd(this->fd_);
 #endif

esphome/components/socket/socket.h

@@ -49,10 +49,11 @@ inline bool socket_ready(struct lwip_sock *cached_sock) {
   return cached_sock == nullptr || esphome_lwip_socket_has_data(cached_sock);
 }
 
-/// Resolve an fd to its lwip_sock and hook the netconn event callback so the main loop
+/// Resolve an fd to its lwip_sock and install the netconn event-callback hook so the
-/// is woken by FreeRTOS task notifications. Shared between BSD and LwIP socket impls.
+/// main loop is woken by FreeRTOS task notifications when data arrives. Shared between
-/// Returns the cached lwip_sock pointer (or nullptr if fd is invalid).
+/// BSD and LwIP socket impls on the fast-select path. Returns the cached lwip_sock
-inline struct lwip_sock *fast_select_hook_fd(int fd) {
+/// pointer (or nullptr if the fd does not map to a valid lwip_sock).
+inline struct lwip_sock *hook_fd_for_fast_select(int fd) {
   struct lwip_sock *sock = esphome_lwip_get_sock(fd);
   if (sock != nullptr) {
     esphome_lwip_hook_socket(sock);