feat: external precedent library with auto halacha extraction

Adds a third corpus of legal authority distinct from style_corpus
(Daphna's prior decisions for voice) and case_precedents (chair-attached
quotes per case). The new corpus holds chair-uploaded court rulings and
other appeals committee decisions, with binding rules (הלכות) extracted
automatically and queued for chair approval.

Pipeline (web/app.py + services/precedent_library.py):
file → extract → chunk → Voyage embed → halacha_extractor → store +
publish progress over the existing Redis SSE channel.

Schema V7 (services/db.py): extends case_law with source_kind +
extraction status fields under a CHECK constraint pinning practice_area
to the three appeals committee domains (rishuy_uvniya, betterment_levy,
compensation_197). New precedent_chunks (vector(1024)) and halachot
tables (vector(1024) over rule_statement, IVFFlat indexes, gin on
practice_areas/subject_tags). Halachot start as pending_review; only
approved/published rows are visible to search_precedent_library.

Agents: legal-writer, legal-researcher, legal-analyst, legal-ceo,
legal-qa get search_precedent_library. legal-writer prompt explains
the three-corpus distinction and CREAC use; legal-qa now verifies that
every cited halacha resolves to an approved row in the corpus.

UI: /precedents page with four tabs — library / semantic search /
pending review (J/K nav, A/R/E shortcuts, badge count) / stats.
Reuses the existing upload-sheet progress + SSE pattern.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mcp-server/src/legal_mcp/server.py

@@ -47,6 +47,7 @@ mcp = FastMCP(
 
 from legal_mcp.tools import (  # noqa: E402
     cases, documents, search, drafting, workflow, precedents,
+    precedent_library as plib,
 )
 
 
@@ -142,10 +143,114 @@ async def precedent_remove(precedent_id: str) -> str:
 async def precedent_search_library(
     query: str, practice_area: str = "", limit: int = 10,
 ) -> str:
-    """חיפוש בספרייה הרוחבית של ציטוטים שנצברו בין תיקים."""
+    """חיפוש בציטוטים שדפנה צירפה ידנית לתיקים בעבר (case_precedents).
+    שונה מ-search_precedent_library שמחפש בקורפוס הפסיקה הסמכותית."""
     return await precedents.precedent_search_library(query, practice_area, limit)
 
 
+# ── External Precedent Library — authoritative case-law corpus ─────
+# Distinct from precedent_search_library above (chair-attached quotes)
+# and from search_decisions (Daphna's style corpus).
+
+
+@mcp.tool()
+async def precedent_library_upload(
+    file_path: str,
+    citation: str,
+    case_name: str = "",
+    court: str = "",
+    decision_date: str = "",
+    source_type: str = "",
+    precedent_level: str = "",
+    practice_area: str = "",
+    appeal_subtype: str = "",
+    subject_tags: list[str] | None = None,
+    is_binding: bool = True,
+    headnote: str = "",
+    summary: str = "",
+) -> str:
+    """העלאת פסיקה חיצונית (פס"ד / החלטה של ועדה אחרת) לקורפוס הסמכותי. מחלץ הלכות אוטומטית — כולן ממתינות לאישור היו"ר. practice_area: rishuy_uvniya / betterment_levy / compensation_197."""
+    return await plib.precedent_library_upload(
+        file_path, citation, case_name, court, decision_date,
+        source_type, precedent_level, practice_area, appeal_subtype,
+        subject_tags, is_binding, headnote, summary,
+    )
+
+
+@mcp.tool()
+async def precedent_library_list(
+    practice_area: str = "",
+    court: str = "",
+    precedent_level: str = "",
+    source_type: str = "",
+    search: str = "",
+    limit: int = 100,
+) -> str:
+    """רשימת הפסיקה בקורפוס הסמכותי, עם פילטרים."""
+    return await plib.precedent_library_list(
+        practice_area, court, precedent_level, source_type, search, limit,
+    )
+
+
+@mcp.tool()
+async def precedent_library_get(case_law_id: str) -> str:
+    """פסיקה ספציפית בקורפוס + רשימת ההלכות שחולצו ממנה (כולל ממתינות לאישור)."""
+    return await plib.precedent_library_get(case_law_id)
+
+
+@mcp.tool()
+async def precedent_library_delete(case_law_id: str) -> str:
+    """מחיקת פסיקה מהקורפוס (cascade: chunks + halachot)."""
+    return await plib.precedent_library_delete(case_law_id)
+
+
+@mcp.tool()
+async def precedent_extract_halachot(case_law_id: str) -> str:
+    """הרצה מחדש של חילוץ הלכות לפסיקה קיימת. ההלכות הקיימות נמחקות, החדשות חוזרות לסטטוס pending_review."""
+    return await plib.precedent_extract_halachot(case_law_id)
+
+
+@mcp.tool()
+async def search_precedent_library(
+    query: str,
+    practice_area: str = "",
+    court: str = "",
+    precedent_level: str = "",
+    appeal_subtype: str = "",
+    subject_tag: str = "",
+    limit: int = 10,
+    include_halachot: bool = True,
+) -> str:
+    """חיפוש סמנטי בקורפוס הפסיקה הסמכותית. מחזיר הלכות (מאושרות בלבד) + קטעי טקסט. השתמש כש-legal-writer צריך לצטט פסיקה מחייבת בבלוק י (CREAC: rule + explanation)."""
+    return await plib.search_precedent_library(
+        query, practice_area, court, precedent_level, appeal_subtype,
+        None, subject_tag, limit, include_halachot,
+    )
+
+
+@mcp.tool()
+async def halacha_review(
+    halacha_id: str,
+    status: str,
+    reviewer: str = "דפנה",
+    rule_statement: str = "",
+    reasoning_summary: str = "",
+    subject_tags: list[str] | None = None,
+    practice_areas: list[str] | None = None,
+) -> str:
+    """אישור / דחייה / עריכה של הלכה שחולצה אוטומטית. status: pending_review / approved / rejected / published."""
+    return await plib.halacha_review(
+        halacha_id, status, reviewer, rule_statement, reasoning_summary,
+        subject_tags, practice_areas,
+    )
+
+
+@mcp.tool()
+async def halachot_pending(limit: int = 100) -> str:
+    """תור ההלכות הממתינות לאישור."""
+    return await plib.halachot_pending(limit)
+
+
 # Documents
 @mcp.tool()
 async def document_upload(