docs(architect): weekly KB update — 106 files refreshed (2026-04)

Updates across all 5 skills: ms-ai-advisor, ms-ai-engineering,
ms-ai-governance, ms-ai-security, ms-ai-infrastructure.

Key changes:
- Language Services (Custom Text Classification, Text Analytics, QnA):
  retirement warning 2029-03-31, migration guides to Foundry/GPT-4o
- Agentic Retrieval: 50M free reasoning tokens/month (Public Preview)
- Computer Use: Claude Sonnet 4.5 (preview) + OpenAI CUA models
- Agent Registry: Risks column (M365 E7), user-shared/org-published types
- Declarative agents: schema v1.5 → v1.6, Store validation requirements
- MLflow 3: 13 built-in LLM judges, production monitoring, Genie Code
- AG-UI HITL: ApprovalRequiredAIFunction (C#) + @tool(approval_mode) (Python)
- Entra ID Ignite 2025: Agent ID Admin/Developer RBAC roles, Conditional Access
- Security Copilot: 400 SCU/month per 1000 M365 E5 licenses, auto-provisioned
- Fast Transcription API: phrase lists, 14-language multi-lingual transcription
- Azure Monitor Workbooks: Bicep support, RBAC specifics
- Power Platform Copilot: data residency (Norway/Europe → EU DB, Bing → USA)
- RAG security-rbac: 4-approach table (GA + 3 preview access control methods)
- IaC MLOps: Well-Architected OE:05 principles, Bicep/Terraform patterns
- Translator: image file batch translation Preview (JPEG/PNG/BMP/WebP)

All 106 files: Last updated 2026-04 | Verified: MCP 2026-04

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

skills/ms-ai-engineering/references/rag-architecture/multi-index-federation.md

@@ -1,6 +1,6 @@
 # Multi-Index Federation and Cross-Search
 
-**Last updated:** 2026-02
+**Last updated:** 2026-04 | Verified: MCP 2026-04
 **Status:** GA (single-index), Not supported (native cross-index)
 **Category:** RAG Architecture & Semantic Search
 
@@ -16,6 +16,10 @@ For scenarioer der data logisk tilhører separate indekser (ulike skjemaer, comp
 
 **Viktig funn:** Microsofts offisielle FAQ sier eksplisitt: *"Can I search across multiple indexes? No. A query is always scoped to a single index."*
 
+**Multi-region støtte:** Azure AI Search er en single-region service, men du kan oppnå høyere reliability ved å deploye identiske search services i flere regioner. Data synkroniseres via push eller pull (indexer) APIer. Load balancing håndteres av Azure Front Door, Traffic Manager, eller Application Gateway. Data residency: innhold lagres i regionen du velger, uten kryssregional dataflyt uten eksplisitt autorisasjon.
+
+**Multi-vector fields (Preview):** Azure AI Search støtter nå multiple vektorer i ett dokumentfelt via `Collection(Edm.ComplexType)` — opp til 100 vektorer per dokument. Nyttig for multimodal data og lange dokumenter. `perDocumentVectorLimit`-parameteren kontrollerer antall matchende vektorer per dokument i query-resultater.
+
 ## Kjernekomponenter
 
 ### Hvorfor Azure AI Search ikke støtter cross-index queries