feat(ai-sdk): EvidenceType-Schicht — autoritative Fußnoten/Tabellen/Figuren surfacen

Router-Schicht Intent→KnowledgeSpace→EvidenceType→Collection→Merge→Authority (User-
Entscheidung A generalisiert). Neuer EvidenceType{TEXT,FOOTNOTE,TABLE,FIGURE} +
classifyEvidence (aus is_footnote/is_table/is_figure-Payload). RetrieveEvidence() zieht
die autoritative typisierte Evidence GEZIELT aus der KB-Slice (top-20, in-scope) statt
sie im Breit-Basis-Text-Merge zu verlieren; /retrieve liefert footnotes[]/tables[]/
figures[]. Kein perColl-Blindanstieg. Dieselbe Infra trägt C8 (FIGURE) ohne Router-Umbau.

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

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

@@ -200,6 +200,8 @@ func hitsToResults(hits []qdrantSearchHit) []LegalSearchResult {
 			FootnoteLabel:    getString(hit.Payload, "footnote_label"),
 			FootnoteVerbatim: getString(hit.Payload, "footnote_verbatim"),
 			RefCitationUnit:  getString(hit.Payload, "ref_citation_unit"),
+			IsTable:          getBool(hit.Payload, "is_table"),
+			IsFigure:         getBool(hit.Payload, "is_figure"),
 		}
 	}
 	return results