feat: production MCP server with Israeli legislation (multi-source)

Complete production implementation with shell+adapter architecture,
13 MCP tools, SQLite FTS5 search, and multi-source ingestion pipeline.

Ingestion fetches from UCI mirror, UNODC SHERLOC PDFs, and Knesset
mobile PDFs (135 provisions, 33 definitions). 3 acts with full text,
7 acts metadata-only due to gov.il/nevo.co.il access restrictions.
Knesset OData API used for metadata enrichment.

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

src/capabilities.ts

@@ -0,0 +1,64 @@
+/**
+ * Runtime capability detection for Israel Law MCP.
+ * Detects which database tables are available to enable/disable features.
+ */
+
+import type Database from '@ansvar/mcp-sqlite';
+
+export type Capability =
+  | 'core_legislation'
+  | 'eu_references'
+  | 'case_law'
+  | 'preparatory_works';
+
+const TABLE_MAP: Record<Capability, string[]> = {
+  core_legislation: ['legal_documents', 'legal_provisions', 'provisions_fts'],
+  eu_references: ['eu_documents', 'eu_references'],
+  case_law: ['case_law'],
+  preparatory_works: ['preparatory_works'],
+};
+
+export function detectCapabilities(db: InstanceType<typeof Database>): Set<Capability> {
+  const caps = new Set<Capability>();
+  const tables = new Set(
+    (db.prepare("SELECT name FROM sqlite_master WHERE type='table'").all() as { name: string }[])
+      .map(r => r.name)
+  );
+
+  for (const [cap, required] of Object.entries(TABLE_MAP)) {
+    if (required.every(t => tables.has(t))) {
+      caps.add(cap as Capability);
+    }
+  }
+
+  return caps;
+}
+
+export interface DbMetadata {
+  tier: string;
+  schema_version: string;
+  built_at?: string;
+  builder?: string;
+}
+
+export function readDbMetadata(db: InstanceType<typeof Database>): DbMetadata {
+  const meta: Record<string, string> = {};
+  try {
+    const rows = db.prepare('SELECT key, value FROM db_metadata').all() as { key: string; value: string }[];
+    for (const row of rows) {
+      meta[row.key] = row.value;
+    }
+  } catch {
+    // db_metadata table may not exist
+  }
+  return {
+    tier: meta.tier ?? 'free',
+    schema_version: meta.schema_version ?? '1.0',
+    built_at: meta.built_at,
+    builder: meta.builder,
+  };
+}
+
+export function upgradeMessage(feature: string): string {
+  return `The "${feature}" feature requires a professional-tier database. Contact hello@ansvar.ai for access.`;
+}