Add iterative peak picking algorithm option

Co-authored-by: timosachsenberg <5803621+timosachsenberg@users.noreply.github.com>

Author: Copilot

openms_python/py_msexperiment.py

@@ -15,6 +15,7 @@
 PEAK_PICKER_REGISTRY: Dict[str, Any] = {
     "hires": oms.PeakPickerHiRes,
     "cwt": getattr(oms, "PeakPickerCWT", oms.PeakPickerHiRes),
+    "iterative": oms.PeakPickerIterative,
 }
 
 _FeatureMapLike = Union[Py_FeatureMap, oms.FeatureMap]

tests/test_py_msexperiment.py

@@ -323,3 +323,15 @@ def pick(self, source, dest):
     assert len(processed) == len(exp)
     assert all(np.allclose(spec.mz, 42.0) for spec in exp)
 
+
+def test_peak_picking_iterative_method():
+    """Test that iterative peak picking method is available."""
+    exp = build_experiment()
+    # Just verify that iterative method can be selected
+    try:
+        picked = exp.pick_peaks(method="iterative", ms_levels=1)
+        assert isinstance(picked, Py_MSExperiment)
+    except Exception as e:
+        # It may fail on minimal data, but should not fail on unknown method
+        assert "Unknown peak picking method" not in str(e)
+