fix(normalizer): preserve trailing Bemerkung text after parent pattern

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/import-normalizer/persons_tree.py

@@ -267,7 +267,13 @@ def _parse_bemerkung(
         if not m:
             continue
 
-        name_part = m.group(1).strip().rstrip("!., ")
+        # Split the captured group on the first comma or semicolon to separate
+        # the name part from any trailing description (e.g. ", nach Mexiko emigriert")
+        raw_names, _, trailing = m.group(1).strip().partition(",")
+        if not trailing:
+            raw_names, _, trailing = raw_names.partition(";")
+        name_part = raw_names.strip().rstrip("!., ")
+        remainder = trailing.strip().lstrip(".,! ")
         parts = [p.strip() for p in _AND_RE.split(name_part) if p.strip()]
         rels: list[dict] = []
         unres: list[dict] = []
@@ -300,7 +306,6 @@ def _parse_bemerkung(
                     "reason": reason,
                 })
 
-        remainder = s[m.end():].strip().lstrip(".,! ")
         return rels, unres, remainder
 
     # No pattern matched — full text goes to notes, nothing to unresolved

tools/import-normalizer/tests/test_persons_tree.py

@@ -418,3 +418,16 @@ def test_parse_bemerkung_plain_remark():
     )
     assert rels == [] and unres == []
     assert notes == "Verfasserin der Cram-Chronik !!"
+
+
+def test_parse_bemerkung_sohn_with_trailing_remark():
+    _, idx = _register(
+        ("row_019", "Clara", "Cram", "de Gruyter"),
+        ("row_028", "Herbert", "Cram", None),
+    )
+    rels, unres, notes = persons_tree._parse_bemerkung(
+        "row_021", "Sohn v Clara Cram u Herbert Cram, nach Mexiko emigriert", idx
+    )
+    assert len(rels) == 2
+    assert unres == []
+    assert notes == "nach Mexiko emigriert"