feat(lamni): print the base shift in tomo_scan_projection

Next to the X-ray eye correction and the constant shift, also print
the base shift (tomo_fovx/y_offset, from center finding / first X-ray
eye click) at 0 deg and rotated to the projection angle, as applied by
lamni_fermat_scan.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LJWYXx4SS8NgFWog81xjyf

csaxs_bec/bec_ipython_client/plugins/LamNI/lamni.py

@@ -32,6 +32,7 @@ from csaxs_bec.bec_ipython_client.plugins.OMNY_shared.tomo_angle_file_mixin impo
     TomoAngleFileMixin,
 )
 from csaxs_bec.bec_ipython_client.plugins.OMNY_shared.tomo_queue_mixin import TomoQueueMixin
+from csaxs_bec.scans.lamni_components import LamNIComponents
 
 from .lamni_optics_mixin import LaMNIInitStages, LamNIOpticsMixin
 from .x_ray_eye_align import XrayEyeAlign as XrayEyeAlignGUI
@@ -1410,6 +1411,15 @@ class LamNI(
         additional_correction = self.compute_additional_correction(angle)
         additional_correction_2 = self.compute_additional_correction_2(angle)
         correction_xeye_mu = self.lamni_compute_additional_correction_xeye_mu(angle)
+        # base shift (center finding / first X-ray eye click), rotated to this
+        # angle by lamni_fermat_scan via center_x/center_y
+        base_x, base_y = LamNIComponents.lamni_compute_scan_center(
+            self.tomo_fovx_offset, self.tomo_fovy_offset, angle
+        )
+        print(
+            f"Base shift: x={self.tomo_fovx_offset:.6f} mm, y={self.tomo_fovy_offset:.6f} mm"
+            f" at 0 deg -> x={base_x:.6f} mm, y={base_y:.6f} mm  @ angle={angle}"
+        )
         print(f"Constant shift: x={self.manual_shift_x}, y={self.manual_shift_y}")
 
         self._current_scan_list = []

tests/tests_bec_ipython_client/test_lamni_golive_fixes.py

@@ -428,6 +428,21 @@ def test_tomo_scan_projection_reconstructs_once_per_projection_not_per_tile(proj
     assert projection_env.reconstruct_calls == [1]
 
 
+def test_tomo_scan_projection_prints_base_shift(projection_env, capsys):
+    from csaxs_bec.scans.lamni_components import LamNIComponents
+
+    # stored in um (X-ray eye shift_xy); tomo_fovx/y_offset return mm
+    projection_env.client.set_global_var("tomo_fov_offset", [100.0, 200.0])
+    projection_env.tomo_scan_projection(30.0, _internal=True)
+
+    rot_x, rot_y = LamNIComponents.lamni_compute_scan_center(0.1, 0.2, 30.0)
+    out = capsys.readouterr().out
+    assert (
+        f"Base shift: x=0.100000 mm, y=0.200000 mm at 0 deg -> "
+        f"x={rot_x:.6f} mm, y={rot_y:.6f} mm  @ angle=30.0"
+    ) in out
+
+
 def test_tomo_scan_projection_can_skip_reconstruction(projection_env):
     projection_env.tomo_scan_projection(30.0, _internal=True, _reconstruct=False)