fix(nevo): strip preamble/mini-ratio from court rulings too (#86.1)

strip_nevo_preamble's _DECISION_START only matched ועדת-ערר openings (בפנינו /
הערר שבנדון / ...), so Nevo COURT judgments — exactly the ones carrying a
מיני-רציו — slipped through unstripped. The editorial mini-ratio then leaked into
the chunked body, risking that the halacha extractor reads Nevo's answer key
(contamination) and polluting the corpus. Proven on בג"ץ 1764/05: its full_text
still contained the מיני-רציו (unstripped).

Fix:
- Extend _DECISION_START with court-ruling openings: פסק-דין/פסק דין header and
  the authoring-judge line (השופט/ת, כב' השופט, הנשיא, המשנה לנשיא). re.search
  picks the earliest line-start match → the real opinion start, not the prose
  ratio above it.
- Widen the Nevo-marker detection window 400→1500 chars so a long court/parties
  header doesn't push חקיקה שאוזכרה:/מיני-רציו: out of range.

Verified on the real 1764/05 full_text: strips 2702 chars, body now starts at
'השופט ס' ג'ובראן:', מיני-רציו gone. Regression: ועדת-ערר openings still strip;
non-Nevo text untouched; markers-past-400 now detected. Suite 182 passed (6 new).

This is the anti-contamination prerequisite for the Nevo-ratio gold-set (#86.3/#81.7).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

mcp-server/src/legal_mcp/services/extractor.py

@@ -358,8 +358,16 @@ def render_pages_for_multimodal(
 _NEVO_MARKERS = ("ספרות:", "חקיקה שאוזכרה:", "מיני-רציו:", "פסקי דין שאוזכרו:",
                  "כתבי עת:", "הועתק מנבו")
 
+# Markers for where the actual decision body begins (everything before is Nevo
+# preamble: bibliography + מיני-רציו). Two families:
+#   - ועדת ערר / district openings (בפנינו / הערר שבנדון / ...)
+#   - COURT-RULING openings (#86.1): a פסק-דין header or the authoring judge's
+#     line ("השופט/ת X:", "כב' השופט", "הנשיא"). Without these, Nevo court
+#     judgments — exactly the ones carrying a מיני-רציו — slipped through unstripped
+#     (e.g. בג"ץ 1764/05), risking that the extractor reads Nevo's answer key.
 _DECISION_START = re.compile(
-    r"^(בפנינו|לפנינו|הערר שבנדון|ועדת הערר לתכנון|רקע עובדתי|עסקינן)",
+    r"^(בפנינו|לפנינו|לפניי|הערר שבנדון|ועדת הערר לתכנון|רקע עובדתי|עסקינן|"
+    r"פסק[- ]דין|פסק[- ]דינו|כב(?:וד)?['׳]?\s*השופט|המשנה לנשיא|הנשיא|השופט)",
     re.MULTILINE,
 )
 
@@ -369,7 +377,9 @@ def strip_nevo_preamble(text: str) -> str:
 
     Returns the original text unchanged if no preamble is detected.
     """
-    head = text[:400]
+    # Window wide enough to catch the Nevo markers even when a long court/parties
+    # header precedes them (court rulings push חקיקה שאוזכרה:/מיני-רציו: down).
+    head = text[:1500]
     if not any(marker in head for marker in _NEVO_MARKERS):
         return text
     m = _DECISION_START.search(text)