M76 Host Pause Feature (#21738)

Marlin/Configuration_adv.h

  */
 //#define HOST_ACTION_COMMANDS
 #if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PAUSE_M76
   //#define HOST_PROMPT_SUPPORT
   //#define HOST_START_MENU_ITEM  // Add a menu item that tells the host to start
 #endif

Marlin/src/gcode/stats/M75-M78.cpp

 #include "../gcode.h"
 #include "../../module/printcounter.h"
 #include "../../lcd/marlinui.h"
+#if ENABLED(HOST_PAUSE_M76)
+  #include "../../feature/host_actions.h"
+#endif
 
 #include "../../MarlinCore.h" // for startOrResumeJob
 
  */
 void GcodeSuite::M76() {
   print_job_timer.pause();
+  TERN_(HOST_PAUSE_M76, host_action_pause());
 }
 
 /**

buildroot/tests/rambo

            ENDSTOP_NOISE_THRESHOLD FAN_SOFT_PWM \
            FIX_MOUNTED_PROBE PROBING_ESTEPPERS_OFF AUTO_BED_LEVELING_LINEAR DEBUG_LEVELING_FEATURE PROBE_OFFSET_WIZARD \
            Z_SAFE_HOMING SHOW_TEMP_ADC_VALUES HOME_Y_BEFORE_X EMERGENCY_PARSER \
-           SD_ABORT_ON_ENDSTOP_HIT HOST_ACTION_COMMANDS HOST_PROMPT_SUPPORT ADVANCED_OK M114_DETAIL \
+           SD_ABORT_ON_ENDSTOP_HIT HOST_ACTION_COMMANDS HOST_PROMPT_SUPPORT HOST_PAUSE_M76 ADVANCED_OK M114_DETAIL \
            VOLUMETRIC_DEFAULT_ON NO_WORKSPACE_OFFSETS EXTRA_FAN_SPEED FWRETRACT \
            USE_CONTROLLER_FAN CONTROLLER_FAN_EDITABLE CONTROLLER_FAN_USE_Z_ONLY
 exec_test $1 $2 "Rambo | CoreXY, Gradient Mix | Endstop Int. | Home Y > X | FW Retract ..." "$3"