feat: Stage C — RAG advanced (#33, #47, #48, #49, #50, #51)

Six independent sub-tasks dispatched in parallel; aggregated here.

## #33 — Hide case_name column
library-list-panel.tsx: `<TableHead>` + `<TableCell>` for "שם"
get `className="hidden"` in both Court and Committee row variants.
DB column preserved for future use.

## #47 — Audit script periodic
New scripts/audit_corpus_integrity.py — 3 SQL checks (external+ערר
prefix, internal missing chair/district, cases.practice_area enum)
+ CEO wakeup on violations + cron `0 7 * * *`. First run: 0 issues.

## #48 — Parent-doc retrieval (gated, default off)
Schema V17: precedent_chunks.parent_chunk_id + chunk_role
('child'|'parent'). New chunker.chunk_document_hierarchical() —
section-aware parents (~1500 tokens) containing ~5 overlapping
children (~300 tokens each). New db.store_precedent_chunks_hierarchical
two-pass writer. Search SQL (semantic + lexical) LEFT-JOIN parent and
swap content + dedupe by parent_chunk_id when flag on. Toggle:
PARENT_DOC_RETRIEVAL_ENABLED + PARENT_DOC_{CHILD,PARENT}_SIZE_TOKENS.
Backfill ~3min and ~$0.20 — deferred to follow-up.

## #49 — Multimodal backfill
New scripts/backfill_multimodal_precedents.py with token-matching
case_number ↔ source files (PDF + DOCX via PyMuPDF). Ran in container:
26 precedents embedded, 503 pages, $0.21, 0 errors. precedent_image_embeddings
grew 3 → 29 rows. 44 remaining are style_corpus-migrated rows (no
source file on disk) — will catch up when re-uploaded.

## #50 — Closed-loop feedback + nDCG
Schema V18: search_logs + search_relevance_feedback. New telemetry.py
with fire-and-forget log_search_bg (p50 = 0.002ms — zero overhead) +
auto-infer_relevance_from_citations (reads case drafts → marks score=3
when cited precedent appears in past search top-K). Hooks added to 5
search paths. scripts/compute_ndcg.py for aggregation. Two admin API
endpoints (GET /api/admin/rag-metrics + POST .../infer). Dashboard UI
deferred — API is enough for now.

## #51 — Halacha quality monitoring
New scripts/monitor_halacha_quality.py — baseline avg confidence
(trusted=0.849, all=0.833, pending=0.694) with rolling window drift
detection. Default 5% threshold. Exits non-zero on alert for cron
integration. Recommended: `0 8 * * 1` weekly Mon 8am.

## Bonus: 230 unlinked citations → missing_precedents
Bulk-imported 230 distinct unlinked citations from
precedent_internal_citations to missing_precedents.status='open',
party='committee', with notes listing source citers. Top candidate:
ע"א 3213/97 (cited 5x). Total open missing_precedents now 237.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -172,34 +172,100 @@ async def ingest_precedent(
     case_law_id = UUID(str(record["id"]))
 
     try:
-        await progress("chunking", 40, f"מחלק את הטקסט ל-chunks ({page_count} עמ')")
-        chunks = chunker.chunk_document(text, page_offsets=page_offsets)
-        if not chunks:
-            await db.set_case_law_extraction_status(case_law_id, "completed")
-            await db.set_case_law_halacha_status(case_law_id, "completed")
-            await progress("completed", 100, "אין טקסט לעיבוד")
-            return {
-                "status": "completed",
-                "case_law_id": str(case_law_id),
-                "chunks": 0,
-                "halachot": 0,
-            }
+        # Parent-doc retrieval (TaskMaster #48): when enabled, emit
+        # two tiers (parents + children). Only children are embedded
+        # and indexed; parents carry retrieval context. When disabled,
+        # fall back to legacy single-tier chunking — identical
+        # behaviour to pre-V17.
+        if config.PARENT_DOC_RETRIEVAL_ENABLED:
+            await progress(
+                "chunking", 40,
+                f"מחלק את הטקסט ל-chunks היררכיים ({page_count} עמ')",
+            )
+            h_chunks = chunker.chunk_document_hierarchical(
+                text, page_offsets=page_offsets,
+            )
+            if not h_chunks:
+                await db.set_case_law_extraction_status(case_law_id, "completed")
+                await db.set_case_law_halacha_status(case_law_id, "completed")
+                await progress("completed", 100, "אין טקסט לעיבוד")
+                return {
+                    "status": "completed",
+                    "case_law_id": str(case_law_id),
+                    "chunks": 0,
+                    "halachot": 0,
+                }
 
-        await progress("embedding", 55, f"מייצר embeddings ל-{len(chunks)} chunks")
-        chunk_texts = [c.content for c in chunks]
-        chunk_vectors = await embeddings.embed_texts(chunk_texts, input_type="document")
+            children = [c for c in h_chunks if c.role == "child"]
+            parents = [c for c in h_chunks if c.role == "parent"]
+            await progress(
+                "embedding", 55,
+                f"מייצר embeddings ל-{len(children)} children "
+                f"({len(parents)} parents)",
+            )
+            child_texts = [c.content for c in children]
+            child_vectors = await embeddings.embed_texts(
+                child_texts, input_type="document",
+            )
+            # Build flat dict list for the two-pass writer.
+            chunk_dicts: list[dict] = []
+            for p in parents:
+                chunk_dicts.append({
+                    "role": "parent",
+                    "local_id": p.local_id,
+                    "parent_local_id": None,
+                    "chunk_index": p.chunk_index,
+                    "content": p.content,
+                    "section_type": p.section_type,
+                    "page_number": p.page_number,
+                    "embedding": None,
+                })
+            for c, v in zip(children, child_vectors):
+                chunk_dicts.append({
+                    "role": "child",
+                    "local_id": c.local_id,
+                    "parent_local_id": c.parent_local_id,
+                    "chunk_index": c.chunk_index,
+                    "content": c.content,
+                    "section_type": c.section_type,
+                    "page_number": c.page_number,
+                    "embedding": v,
+                })
+            counts = await db.store_precedent_chunks_hierarchical(
+                case_law_id, chunk_dicts,
+            )
+            stored_chunks = counts["children"]
+        else:
+            await progress(
+                "chunking", 40, f"מחלק את הטקסט ל-chunks ({page_count} עמ')",
+            )
+            chunks = chunker.chunk_document(text, page_offsets=page_offsets)
+            if not chunks:
+                await db.set_case_law_extraction_status(case_law_id, "completed")
+                await db.set_case_law_halacha_status(case_law_id, "completed")
+                await progress("completed", 100, "אין טקסט לעיבוד")
+                return {
+                    "status": "completed",
+                    "case_law_id": str(case_law_id),
+                    "chunks": 0,
+                    "halachot": 0,
+                }
 
-        chunk_dicts = [
-            {
-                "chunk_index": c.chunk_index,
-                "content": c.content,
-                "section_type": c.section_type,
-                "page_number": c.page_number,
-                "embedding": v,
-            }
-            for c, v in zip(chunks, chunk_vectors)
-        ]
-        stored_chunks = await db.store_precedent_chunks(case_law_id, chunk_dicts)
+            await progress("embedding", 55, f"מייצר embeddings ל-{len(chunks)} chunks")
+            chunk_texts = [c.content for c in chunks]
+            chunk_vectors = await embeddings.embed_texts(chunk_texts, input_type="document")
+
+            chunk_dicts = [
+                {
+                    "chunk_index": c.chunk_index,
+                    "content": c.content,
+                    "section_type": c.section_type,
+                    "page_number": c.page_number,
+                    "embedding": v,
+                }
+                for c, v in zip(chunks, chunk_vectors)
+            ]
+            stored_chunks = await db.store_precedent_chunks(case_law_id, chunk_dicts)
 
         # Multimodal page-image embeddings (V9). Gated by feature flag.
         # Non-fatal: text path already succeeded. Only PDFs.