fix: move exptime validation in front of all rotation scans

src/aare/daq/daq.py

@@ -1398,6 +1398,9 @@ class AareDAQ:
         Returns:
             CompletedRotationScan result or None if failed
         """
+        if rotation_request.exp_time_s < 0.004:
+            logger.warning("Exposure time too short for PXII rotation scan")
+            rotation_request.exp_time_s = 0.004
         try:
             return self._create_rotation_service().run(rotation_request)
         except JFJochCommunicationError as e:

src/aare/daq/operations/rotation/service.py

@@ -25,9 +25,6 @@ class RotationService:
     def _execute_scan(self, request: RotationScanRequest) -> CompletedRotationScan:
         omega_start = self.ctx.deps.devs.aerotech_omega
 
-        if request.exp_time_s < 0.004:
-            self.logger.warning("Exposure time too short for PXII rotation scan")
-            request.exp_time_s = 0.004
 
         total_time = request.exp_time_s * request.steps
         sample = self.ctx.sample