🚸 M115 spindle/laser (#24681, #24747)

Marlin/src/gcode/host/M115.cpp

@@ -130,6 +130,13 @@ void GcodeSuite::M115() {
     cap_line(F("TOGGLE_LIGHTS"), ENABLED(CASE_LIGHT_ENABLE));
     cap_line(F("CASE_LIGHT_BRIGHTNESS"), TERN0(CASE_LIGHT_ENABLE, caselight.has_brightness()));
 
+    // SPINDLE AND LASER CONTROL (M3, M4, M5)
+    #if ENABLED(SPINDLE_FEATURE)
+      cap_line(F("SPINDLE"), true);
+    #elif ENABLED(LASER_FEATURE)
+      cap_line(F("LASER"), true);
+    #endif
+
     // EMERGENCY_PARSER (M108, M112, M410, M876)
     cap_line(F("EMERGENCY_PARSER"), ENABLED(EMERGENCY_PARSER));