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_client.go

@@ -95,12 +95,29 @@ func (c *LegalRAGClient) searchInternal(ctx context.Context, collection string,
 
 	results := make([]LegalSearchResult, len(hits))
 	for i, hit := range hits {
+		// Legal-Metadaten nach rag_reingest_spec.md §2: bevorzugt die normalisierten Felder
+		// (article_label/regulation_code/article/...); Fallback auf alte Feldnamen, solange der
+		// Korpus noch nicht re-ingestiert ist (regulation_id, section="§ 38").
+		regCode := getString(hit.Payload, "regulation_code")
+		if regCode == "" {
+			regCode = getString(hit.Payload, "regulation_id")
+		}
+		article := getString(hit.Payload, "article")
+		if article == "" {
+			article = getString(hit.Payload, "section")
+		}
 		results[i] = LegalSearchResult{
 			Text:            getString(hit.Payload, "chunk_text"),
-			RegulationCode:  getString(hit.Payload, "regulation_id"),
+			RegulationCode:  regCode,
 			RegulationName:  getString(hit.Payload, "regulation_name_de"),
 			RegulationShort: getString(hit.Payload, "regulation_short"),
 			Category:        getString(hit.Payload, "category"),
+			ArticleLabel:    getString(hit.Payload, "article_label"),
+			Article:         article,
+			Paragraph:       getString(hit.Payload, "paragraph"),
+			Sub:             getString(hit.Payload, "sub"),
+			IsRecital:       getBool(hit.Payload, "is_recital"),
+			CitationStyle:   getString(hit.Payload, "citation_style"),
 			Pages:           getIntSlice(hit.Payload, "pages"),
 			SourceURL:       getString(hit.Payload, "source"),
 			Score:           hit.Score,