fix(omny): expose switchbox put_and_receive, report switchbox reply in errors

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

csaxs_bec/devices/omny/rt/rt_omny_ophyd.py

@@ -65,6 +65,7 @@ class RtOMNYController(Controller):
         "laser_tracker_check_enabled",
         "_omny_interferometer_switch_open_socket",
         "_omny_interferometer_switch_channel",
+        "_omny_interferometer_switch_put_and_receive",
         "_omny_interferometer_switch_LED_on",
         "_omny_interferometer_switch_alloff",
         "_omny_interferometer_get_signalsample",
@@ -809,7 +810,9 @@ class RtOMNYController(Controller):
             # if "|C000\r" != self._omny_interferometer_switch_put_and_receive("!002C000\r"):
             #     raise RtOMNY_mirror_switchbox_Error("Channel switching failed.")
         if "0000" not in rback:
-            raise RtOMNY_mirror_switchbox_Error("Channel switching failed.")
+            raise RtOMNY_mirror_switchbox_Error(
+                f"Channel switching failed. Switchbox replied {rback!r}"
+            )
 
     def _omny_interferometer_switch_put_and_receive(self, command_str: str) -> str:
         try:
@@ -839,7 +842,9 @@ class RtOMNYController(Controller):
         alloff = self._omny_interferometer_switch_put_and_receive("?002\r")
         # check all off
         if "00" not in alloff:
-            raise RtOMNY_mirror_switchbox_Error("Not all channels switched off.")
+            raise RtOMNY_mirror_switchbox_Error(
+                f"Not all channels switched off. Switchbox replied {alloff!r}"
+            )
 
     def _rt_start_averaging_SSI(self):
         self.socket_put("J3")