feat: Stage A finalizers + #35/#36/#37 — critical-gap closure

Four parallel sub-agents closed the remaining critical gaps from the
26/05 Stage A/B sprint. Each block independently tested; aggregated here.

## #30/#31 finalizers (sub-agent A)
* Auto-derive practice_area in case_create from case_number prefix
  (1xxx→rishuy_uvniya, 8xxx→betterment_levy, 9xxx→compensation_197);
  default for CaseCreateRequest is now "" (the DB constraint catches
  any stray "appeals_committee").
* practice_area.py: derive_subtype now handles axis-B domain values
  (rishuy_uvniya/betterment_levy/compensation_197) without parsing the
  case number; new helper derive_domain_practice_area().
* Halacha re-extraction verified unnecessary — all 6 reclassified
  records already had is_binding=false and approved halachot.
* Regression tests: 6 cases in tests/test_corpus_constraints.py
  covering practice_area enum, internal-committee chair/district,
  external-upload arar prefix, MCP guard.
* UI: district input → Select dropdown (7 districts) in
  precedent-edit-sheet.tsx, preserving legacy free-text values.

## #37 בל"מ subtypes (sub-agent B)
* 3 new appeal_subtypes: extension_request_{building_permit,
  betterment_levy,compensation}. APPEALS_COMMITTEE_SUBTYPES extended,
  SUBTYPES_BY_AREA mappings added.
* New helpers: is_blam_subject(), is_blam_subtype(),
  derive_subtype_with_blam(case_number, subject, practice_area).
  case_create now uses it to auto-detect "בקשה להארכת מועד" subjects.
* 3 methodology templates under docs/methodology/extension-request-*.md.
* paperclip_client.py mapping updated for the 3 new subtypes
  (extension_request_building_permit→CMP, the other two→CMPA).
* Frontend: bilingual "בל"מ" badge + filter dropdown on cases list +
  detail header; appeal-type-bars collapseBlam() merges בל"מ into its
  parent domain for aggregate bars.
* Wizard auto-detects בל"מ from subject during case creation.
* 3 Berlinger cases (1017/1018/1019-03-26) migrated to
  appeal_subtype=extension_request_building_permit via psql.

## #35 missing_precedents feature (sub-agent C)
* Schema V13: missing_precedents table (citation, case_id, party,
  legal_topic, status, linked_case_law_id, claim_quote, ...) +
  FK constraints + 3 indexes. Applied via psql + idempotent migration.
* 6 db.py service functions, 3 MCP tools, 6 FastAPI endpoints
  (POST/GET/PATCH/DELETE/upload — upload routes by citation prefix
  to ingest_internal_decision or ingest_precedent).
* Next.js page /missing-precedents with 5 status tabs + filters +
  sidebar badge counter + detail drawer with metadata edit + smart
  upload form that switches fields per committee/court.
* Bootstrap: 7 rows imported from the JSON file
  (3 citations × cases, all status=closed with linked_case_law_id).
* legal-researcher.md: new §2ב.5 with missing_precedent_create
  usage + dedup semantics + tool grant.

## #36 legal_arguments aggregation (sub-agent D)
* Schema V14: legal_arguments + legal_argument_propositions M:M.
  Applied via psql.
* New service argument_aggregator.py with two functions —
  aggregate_claims_to_arguments() (Claude CLI / claude_session) and
  get_legal_arguments(). Graceful llm_unavailable handling when CLI
  is missing (containers).
* 2 MCP tools + 2 API endpoints (POST .../aggregate-arguments as
  BackgroundTask, GET .../legal-arguments).
* Frontend: shadcn Accordion + new legal-arguments-panel.tsx with
  hierarchical (party → priority badge → arguments) display, "טיעונים"
  tab on the case page, "חשב/חשב מחדש" buttons.
* scripts/backfill_legal_arguments.py + SCRIPTS.md entry — dry-run
  found 8 candidate cases including 1017/1018/1019.

## Open follow-ups (intentionally deferred)
* npm run api:types in web-ui (CLAUDE.md flow) — recommended before
  the next UI commit; not required for backend deployment.
* Run backfill_legal_arguments.py --apply once the container picks up
  the new aggregator service.
* webhook on missing-precedents upload-close to Paperclip (optional).

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

web-ui/src/components/missing-precedents/missing-precedents-table.tsx

@@ -0,0 +1,223 @@
+"use client";
+
+import { useState } from "react";
+import { Trash2, Upload, Pencil, ExternalLink } from "lucide-react";
+import { toast } from "sonner";
+import Link from "next/link";
+import {
+  Table, TableBody, TableCell, TableHead, TableHeader, TableRow,
+} from "@/components/ui/table";
+import { Button } from "@/components/ui/button";
+import { Badge } from "@/components/ui/badge";
+import { Skeleton } from "@/components/ui/skeleton";
+import {
+  useMissingPrecedents,
+  useDeleteMissingPrecedent,
+  CITED_BY_PARTY_LABELS,
+  STATUS_LABELS,
+  type MissingPrecedent,
+  type MissingPrecedentStatus,
+} from "@/lib/api/missing-precedents";
+import { MissingPrecedentDetailDrawer } from "./missing-precedent-detail-drawer";
+
+function formatDate(iso: string | null) {
+  if (!iso) return "—";
+  try {
+    return new Date(iso).toLocaleDateString("he-IL");
+  } catch {
+    return iso;
+  }
+}
+
+function StatusBadge({ status }: { status: MissingPrecedentStatus }) {
+  const variants: Record<MissingPrecedentStatus, string> = {
+    open: "bg-gold-wash text-gold-deep border-gold/40",
+    uploaded: "bg-rule-soft text-ink-muted border-rule",
+    closed: "bg-emerald-50 text-emerald-800 border-emerald-300/60",
+    irrelevant: "bg-rule-soft text-ink-muted border-rule line-through",
+  };
+  return (
+    <Badge variant="outline" className={variants[status]}>
+      {STATUS_LABELS[status]}
+    </Badge>
+  );
+}
+
+function TableSkeleton({ cols }: { cols: number }) {
+  return (
+    <>
+      {Array.from({ length: 4 }).map((_, i) => (
+        <TableRow key={i} className="border-rule">
+          {Array.from({ length: cols }).map((__, j) => (
+            <TableCell key={j}>
+              <Skeleton className="h-4 w-full" />
+            </TableCell>
+          ))}
+        </TableRow>
+      ))}
+    </>
+  );
+}
+
+type Props = {
+  status?: MissingPrecedentStatus | "";
+  caseNumber?: string;
+  legalTopic?: string;
+};
+
+export function MissingPrecedentsTable({ status, caseNumber, legalTopic }: Props) {
+  const [openId, setOpenId] = useState<string | null>(null);
+  const { data, isPending, error } = useMissingPrecedents({
+    status: status === "" ? undefined : status,
+    caseNumber,
+    legalTopic,
+    limit: 200,
+  });
+  const del = useDeleteMissingPrecedent();
+
+  const handleDelete = async (mp: MissingPrecedent) => {
+    if (!confirm(`למחוק את הרשומה? ${mp.case_name || mp.citation.slice(0, 60)}...`)) {
+      return;
+    }
+    try {
+      await del.mutateAsync(mp.id);
+      toast.success("הרשומה נמחקה");
+    } catch (e) {
+      toast.error("מחיקה נכשלה");
+      console.error(e);
+    }
+  };
+
+  if (error) {
+    return (
+      <div className="rounded bg-danger-bg border border-danger/40 px-6 py-4 text-danger text-center text-sm">
+        {error.message}
+      </div>
+    );
+  }
+
+  return (
+    <>
+      <div className="rounded-lg border border-rule bg-surface shadow-sm overflow-hidden">
+        <Table>
+          <TableHeader className="bg-rule-soft/60">
+            <TableRow className="border-rule">
+              <TableHead className="text-navy text-right">פסיקה</TableHead>
+              <TableHead className="text-navy text-right">נושא</TableHead>
+              <TableHead className="text-navy text-right">תיק</TableHead>
+              <TableHead className="text-navy text-right">צד מצטט</TableHead>
+              <TableHead className="text-navy text-right">סטטוס</TableHead>
+              <TableHead className="text-navy text-right">נוצר</TableHead>
+              <TableHead className="text-navy" />
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {isPending ? (
+              <TableSkeleton cols={7} />
+            ) : !data?.items.length ? (
+              <TableRow className="border-rule">
+                <TableCell colSpan={7} className="text-center text-ink-muted py-8">
+                  אין פסיקות חסרות בקריטריונים הנוכחיים.
+                </TableCell>
+              </TableRow>
+            ) : (
+              data.items.map((mp) => (
+                <TableRow
+                  key={mp.id}
+                  className="border-rule hover:bg-rule-soft/30 cursor-pointer"
+                  onClick={() => setOpenId(mp.id)}
+                >
+                  <TableCell className="max-w-[440px]">
+                    <div className="text-sm text-navy font-medium truncate">
+                      {mp.case_name || mp.citation.split(" ").slice(0, 6).join(" ")}
+                    </div>
+                    <div className="text-[0.72rem] text-ink-muted truncate" dir="rtl">
+                      {mp.citation}
+                    </div>
+                  </TableCell>
+                  <TableCell>
+                    <span className="text-sm text-ink">{mp.legal_topic || "—"}</span>
+                  </TableCell>
+                  <TableCell>
+                    {mp.cited_in_case_number ? (
+                      <Link
+                        href={`/cases/${encodeURIComponent(mp.cited_in_case_number)}`}
+                        onClick={(e) => e.stopPropagation()}
+                        className="text-sm text-navy hover:text-gold-deep inline-flex items-center gap-1"
+                      >
+                        {mp.cited_in_case_number}
+                        <ExternalLink className="w-3 h-3" />
+                      </Link>
+                    ) : (
+                      <span className="text-ink-muted text-sm">—</span>
+                    )}
+                  </TableCell>
+                  <TableCell className="text-sm text-ink">
+                    {mp.cited_by_party
+                      ? CITED_BY_PARTY_LABELS[mp.cited_by_party]
+                      : "—"}
+                    {mp.cited_by_party_name ? (
+                      <div className="text-[0.7rem] text-ink-muted truncate max-w-[160px]">
+                        {mp.cited_by_party_name}
+                      </div>
+                    ) : null}
+                  </TableCell>
+                  <TableCell>
+                    <StatusBadge status={mp.status} />
+                    {mp.linked_case_law_number ? (
+                      <div className="text-[0.7rem] text-emerald-700 mt-1">
+                        ↳ {mp.linked_case_law_name || mp.linked_case_law_number}
+                      </div>
+                    ) : null}
+                  </TableCell>
+                  <TableCell className="text-[0.78rem] text-ink-muted">
+                    {formatDate(mp.created_at)}
+                  </TableCell>
+                  <TableCell className="text-end">
+                    <div className="flex items-center justify-end gap-1">
+                      <Button
+                        variant="ghost"
+                        size="sm"
+                        onClick={(e) => {
+                          e.stopPropagation();
+                          setOpenId(mp.id);
+                        }}
+                        title={mp.status === "open" ? "העלאה" : "פרטים"}
+                      >
+                        {mp.status === "open" ? (
+                          <Upload className="w-4 h-4" />
+                        ) : (
+                          <Pencil className="w-4 h-4" />
+                        )}
+                      </Button>
+                      <Button
+                        variant="ghost"
+                        size="sm"
+                        onClick={(e) => {
+                          e.stopPropagation();
+                          handleDelete(mp);
+                        }}
+                        disabled={del.isPending}
+                        className="text-danger hover:text-danger"
+                        title="מחיקה"
+                      >
+                        <Trash2 className="w-4 h-4" />
+                      </Button>
+                    </div>
+                  </TableCell>
+                </TableRow>
+              ))
+            )}
+          </TableBody>
+        </Table>
+      </div>
+
+      <MissingPrecedentDetailDrawer
+        id={openId}
+        onOpenChange={(open) => {
+          if (!open) setOpenId(null);
+        }}
+      />
+    </>
+  );
+}