fix(synastry): drop a section title repeated at the start of the body

The gate now rejects that opening and asks for a rewrite, and the saved text no longer keeps the duplicate.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/marriage_match_service/synastry_full_reader_gate.py

@@ -225,6 +225,15 @@ def _scan_prose(text: str, language: str, section: str, *, opening: bool) -> lis
     return failures
 
 
+def _opens_with_title(text: str, title: str) -> bool:
+    heading = title.strip()
+    body = text.lstrip()
+    if not heading or not body.startswith(heading):
+        return False
+    rest = body[len(heading):]
+    return rest == "" or rest[:1].isspace() or rest.startswith(heading)
+
+
 def validate_synastry_reader(
     delivery: dict[str, Any],
     section_inputs: dict[str, Any] | None = None,
@@ -254,6 +263,9 @@ def validate_synastry_reader(
             failures.append(_fail(section_id, "missing_section", section_id))
             continue
         text = str(row.get("text") or "")
+        title = str(row.get("title") or "")
+        if _opens_with_title(text, title):
+            failures.append(_fail(section_id, "repeated_heading", title))
         prose_characters += len(re.sub(r"\s+", "", text))
         prose_words += len(re.findall(r"\b[\w']+\b", text))
         minimum = ZH_SECTION_MINIMUM if language == "zh" else EN_SECTION_MINIMUM