fix: 5 false positives from etogruppe.com ground truth

1. Soft hyphens (­/\xad) stripped before regex matching —
   fixes "Daten­übertrag­barkeit" not matching
2. Art. 15/17/20: allow adjectives between "Recht auf" and keyword
   ("Recht auf unentgeltliche Auskunft" now matches)
3. DSB contact: regex spans up to 300 chars across newlines
   (DSB section with company address between heading and email)
4. Löschkonzept: added "Fortfall", "Entfall", "Beendigung" as
   deletion trigger words alongside "Ablauf"/"Wegfall"

Reduces etogruppe FPs from 5 to ~1.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-compliance/compliance/services/doc_checks/runner.py

@@ -71,7 +71,10 @@ def check_document_completeness(
     Returns a list of findings (summary + missing items).
     """
     findings = []
-    text_lower = text.lower()
+    # Strip soft hyphens (­ / \xad) that CMS tools insert for word-breaking
+    # — they break regex matches on compound words like "Datenübertragbarkeit"
+    text_clean = text.replace("\xad", "").replace("­", "")
+    text_lower = text_clean.lower()
 
     if not text or len(text) < 50:
         findings.append({