feat(advisor): Legal-RAG Zitier-Metadaten — ai-sdk + Advisor/Drafting lesen article_label

ai-sdk (legal_rag_client/scroll/types) liest die gepinnten Spec-Felder
article_label/regulation_code/article/paragraph/sub/citation_style/is_recital
mit Fallback auf alt-ingestierte Chunks (regulation_id, section); neuer getBool-Helfer.
Advisor + Drafting-Engine bilden die Quellenzeile primaer aus article_label
("BDSG § 38 Abs. 1"), sonst aus den strukturierten Feldern. 17 Tests gruen, tsc sauber.
Vertrag: docs-src/development/rag_reingest_spec.md (§2/§7). Deploy an den Re-Ingest
gekoppelt — neue Felder sind bis dahin leer (graceful Fallback).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ai-compliance-sdk/internal/ucca/legal_rag_scroll.go

@@ -191,6 +191,13 @@ func (c *LegalRAGClient) ScrollDocumentIndex(ctx context.Context, collection str
 
 // Helper functions
 
+func getBool(m map[string]interface{}, key string) bool {
+	if v, ok := m[key].(bool); ok {
+		return v
+	}
+	return false
+}
+
 func getString(m map[string]interface{}, key string) string {
 	if v, ok := m[key]; ok {
 		if s, ok := v.(string); ok {