config(sastt): aerox trigger calibration from the 2026-11-03 training scans

Half of backward - forward exposure centre offset per velocity, scans 4897-4917
(trigger_calibration off, DDG1, 500 mm/s^2, settle_time 0.15 s). Scan 4885 is left
out (before the PSO double trigger fix).

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

@@ -38,6 +38,21 @@ aerox:
     - -50
     - 150
     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.
+    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: 40.0, offset: -4.39, scans: [4900, 4917]}
   enabled: true
   onFailure: buffer
   readOnly: false