feat(normalizer): scaffold tool + config tables

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

tools/import-normalizer/tests/test_config.py

@@ -0,0 +1,13 @@
+import config
+
+def test_century_boundaries():
+    assert config.TWO_DIGIT_19XX_MAX == 57
+    assert config.TWO_DIGIT_18XX_MIN == 73
+
+def test_header_maps_cover_required_fields():
+    assert "index" in config.DOCUMENT_HEADER_MAP.values()
+    assert "last_name" in config.PERSON_HEADER_MAP.values()
+
+def test_feast_tables_present():
+    assert config.MOVABLE_FEASTS["pfingsten"] == 49
+    assert config.SEASON_MONTHS["herbst"] == 10