feat: load beam centre model from config

src/aare/beamline_dispatch/default/beamline_dispatch.py

@@ -1,4 +1,6 @@
+import json
 import os
+from importlib.resources import files
 
 from aarecommon.config.beamline import MXBeamline
 from aarecommon.models.beam_centre import BeamCentre
@@ -18,11 +20,14 @@ class DefaultAuthDispatch(AuthDispatch):
 class DefaultGeometry(Geometry):
     def __init__(self, beamline: MXBeamline) -> None:
         super().__init__()
-        self._model = BeamCentre
+        with open(files("aarecommon.config") / "beamline_configs" / "beam_centres.json") as f:
+            measurements = json.loads(f.read())[beamline.value.lower()]
+        self._model = BeamCentre.model_validate(measurements)
         self._beamline = beamline
 
     @property
-    def beam_centre_model(self) -> BeamCentre: ...
+    def beam_centre_model(self) -> BeamCentre:
+        return self._model
 
 
 class DefaultDispatch(BeamlineDispatch):