feat(normalizer): receiver splitting

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

tools/import-normalizer/persons.py

@@ -87,3 +87,55 @@ def parse_register(rows: list[dict]) -> list[Person]:
             seen[p.person_id] = seen.get(p.person_id, 0) + 1
             p.person_id = f"{p.person_id}-{seen[p.person_id]}"
     return people
+
+
+_GEB_RE = re.compile(r",?\s*geb\.?\s+.+$", re.I)
+_PAREN_RE = re.compile(r"\(([^)]+)\)\s*$")
+_MULTI_RE = re.compile(r"\s+(?:und|u)\s+", re.I)
+
+
+def find_known_last_name(segment: str):
+    seg = segment.strip()
+    for ln in config.KNOWN_LAST_NAMES:  # config lists longest-first
+        if seg == ln or seg.endswith(" " + ln):
+            return ln
+    return None
+
+
+def split_receivers(raw: str) -> list[str]:
+    if not raw or not raw.strip():
+        return []
+    # 0. split on "//"
+    if "//" in raw:
+        out = []
+        for seg in raw.split("//"):
+            out.extend(split_receivers(seg))
+        return out
+    cleaned = _GEB_RE.sub("", raw).strip()
+    if not _MULTI_RE.search(cleaned):
+        return [cleaned]
+    shared_last = None
+    pm = _PAREN_RE.search(cleaned)
+    if pm:
+        shared_last = pm.group(1).strip()
+        cleaned = cleaned[:pm.start()].strip()
+    parts = [p.strip() for p in _MULTI_RE.split(cleaned)]
+    parts = [p for p in parts if p and p.lower() != "familie"]
+    if not parts:
+        return []
+    if len(parts) == 1:
+        return [parts[0]]
+    if shared_last:
+        return [p if " " in p else f"{p} {shared_last}" for p in parts]
+    last_seg = parts[-1]
+    detected = find_known_last_name(last_seg)
+    if detected:
+        result = []
+        for p in parts[:-1]:
+            if " " not in p and find_known_last_name(p) is None:
+                result.append(f"{p} {detected}")
+            else:
+                result.append(p)
+        result.append(last_seg)
+        return result
+    return parts