feat(normalizer): day-first month-name matcher

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

tools/import-normalizer/dates.py

@@ -134,8 +134,31 @@ def _match_roman(s):
         return None
 
 
+_MONTH_A_RE = re.compile(r"(\d{1,2})[.\s]*([A-Za-zÄÖÜäöü]+)\.?\s*(\d{2,4})")
+
+
+def _lookup_month(token: str):
+    return config.MONTHS.get(token.lower().strip(" ."))
+
+
+def _build_day_month_year(day, month, year):
+    if not month or year is None or not (1 <= month <= 12):
+        return None
+    try:
+        return datetime.date(year, month, day).isoformat(), Precision.DAY
+    except ValueError:
+        return None
+
+
+def _match_monthname_a(s):
+    m = _MONTH_A_RE.fullmatch(s)
+    if not m:
+        return None
+    return _build_day_month_year(int(m.group(1)), _lookup_month(m.group(2)), expand_year(m.group(3)))
+
+
 # Matchers are tried in order. Later tasks append to this list.
-_MATCHERS = [_match_iso, _match_numeric, _match_roman]
+_MATCHERS = [_match_iso, _match_numeric, _match_roman, _match_monthname_a]
 
 
 def parse_date(raw: str, date_overrides: dict | None = None) -> ParsedDate: