feat(normalizer): person register parsing

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

tools/import-normalizer/tests/test_persons.py

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+import persons
+
+def test_slugify():
+    assert persons.slugify("de Gruyter", "Eugenie") == "de-gruyter-eugenie"
+    assert persons.slugify("Müller", "Karl Erhard") == "mueller-karl-erhard"
+
+def test_parse_register_basic():
+    rows = [
+        {"generation": "G 1", "last_name": "Blomquist", "first_name": "Charlotte,Meta,Jacobi",
+         "maiden_name": "Ruge", "birth_date": "30.8.1862", "birth_place": "Schülperneusiel",
+         "death_date": "1934-07-23", "death_place": "Göteborg", "spouse": '"Tante Lolly"',
+         "notes": "Schwester v Marie Cram"},
+        {"generation": "G 2", "last_name": "Bohrmann", "first_name": "Else",
+         "maiden_name": "Cram", "birth_date": "28.11.1888", "spouse": "Ludwig Bohrmann",
+         "notes": "Schwester v Herbert"},
+    ]
+    people = persons.parse_register(rows)
+    p = people[0]
+    assert p.person_id == "blomquist-charlotte"
+    assert p.first_name == "Charlotte"
+    assert p.maiden_name == "Ruge"
+    assert p.birth_date == "1862-08-30"
+    assert p.nickname == "Tante Lolly"     # quoted spouse field is a nickname, not a spouse
+    assert p.spouse == ""
+    assert "Meta" in p.extra_given_names and "Jacobi" in p.extra_given_names
+    p2 = people[1]
+    assert p2.maiden_name == "Cram"
+    assert p2.spouse == "Ludwig Bohrmann"
+    assert p2.provisional is False