fix(normalizer): suffix all members of a colliding person-id group

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tools/import-normalizer/tests/test_persons.py

@@ -27,3 +27,13 @@ def test_parse_register_basic():
     assert p2.maiden_name == "Cram"
     assert p2.spouse == "Ludwig Bohrmann"
     assert p2.provisional is False
+
+def test_parse_register_dedups_colliding_ids():
+    # Two people with the same first+last name: BOTH get a numeric suffix (no ambiguous base id).
+    people = persons.parse_register([
+        {"last_name": "Cram", "first_name": "Hans"},
+        {"last_name": "Cram", "first_name": "Hans"},
+    ])
+    ids = [p.person_id for p in people]
+    assert ids == ["cram-hans-1", "cram-hans-2"]
+    assert len(set(ids)) == 2