config(sastt): aerox trigger calibration from calibrated scans at 8-30 mm/s

The trigger shift moves backward - forward by ~1.15 x 2 * offset, so the
entries measured with the calibration applied (4921, 4918, 4919, 4920) are
used for 8 / 10 / 20 / 30 mm/s. 20 and 30 mm/s are good to about +-5 um only:
uncorrected backward - forward at 20 mm/s varied from +18 to +28 um.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017NrH3poJsYBCTVq2Y9fuHZ

csaxs_bec/device_configs/sastt_aerotech.yaml

@@ -40,18 +40,21 @@ aerox:
     sign: 1
   userParameter:
     # aerotech_cont_grid trigger calibration: offset [um] = half of the backward - forward
-    # exposure centre offset per scan velocity [mm/s], measured with trigger_calibration=False
-    # (DDG1 trigger, 0.15 s settle_time, 500 mm/s^2; exp_time 5 / 20 ms gave the same within
-    # the scatter). Linear in between, proportional below 1 mm/s, none above 40 mm/s.
-    # The statistics of each scan print the entry it measured.
+    # exposure centre offset per scan velocity [mm/s] (DDG1 trigger, 0.15 s settle_time,
+    # 500 mm/s^2; exp_time 5 / 20 ms gave the same within the scatter). Linear in between,
+    # proportional below 1 mm/s, none above 40 mm/s. The statistics of each scan print the
+    # entry it measured; take it from a scan with the calibration applied: the trigger shift
+    # moves backward - forward by ~1.15 x 2 * offset, the measured entry includes that.
+    # 20 and 30 mm/s: uncorrected backward - forward not reproducible (20 mm/s: +28.5 / +23.0
+    # / +18.3 um in 4899 / 4907 / 4923), good to about +-5 um.
     trigger_calibration:
       - {velocity: 1.0, offset: 0.43, scans: [4901, 4906]}
       - {velocity: 2.0, offset: 1.03, scans: [4902, 4908]}
       - {velocity: 4.0, offset: 4.64, scans: [4903]}
-      - {velocity: 8.0, offset: 7.87, scans: [4897]}
-      - {velocity: 10.0, offset: 9.29, scans: [4898]}
-      - {velocity: 20.0, offset: 12.85, scans: [4899, 4907]}
-      - {velocity: 30.0, offset: 1.50, scans: [4916]}
+      - {velocity: 8.0, offset: 6.52, scans: [4897, 4921]}
+      - {velocity: 10.0, offset: 7.87, scans: [4898, 4918, 4922]}
+      - {velocity: 20.0, offset: 9.06, scans: [4899, 4907, 4919, 4923]}
+      - {velocity: 30.0, offset: -2.91, scans: [4916, 4920]}
       - {velocity: 40.0, offset: -4.39, scans: [4900, 4917]}
   enabled: true
   onFailure: buffer