Add deploy-agent-aks-agentid + teardown-agent-aks-agentid skills (Entra SDK auth-sidecar on AKS)

[vj926]

Summary

Adds an Azure Kubernetes Service variant of the dev (Ollama) sidecar sample, alongside the existing Container Apps tutorial. Same architectural pattern, AKS-native primitives.

What's in this PR

• deploy/azure/kubernetes-service/dev/README.md — Microsoft Learn-style walkthrough (~700 lines).

  • Phase 1 Entra app setup → Phase 2 Azure infra (AKS + ACR + OIDC issuer + Workload Identity addon) → Phase 3 Federated Identity Credential on the Blueprint app → Phase 4 Build → Phase 5 Deploy → Phase 6 Post-deploy Entra config → Phase 7 Verify.
  • Sections on cost, teardown, rotation, troubleshooting.
  • Appendix A: kind smoke test (no Azure required). Appendix B: docker-compose → k8s migration notes.

• .claude/skills/deploy-agent-aks-dev/ — automated fast-path skill mirroring the layout of deploy-agent-aca-dev:

  • scripts/ — per-phase shell + PowerShell scripts, deploy-aks-dev.sh orchestrator, smoke-test-kind.sh.
  • manifests/ — six envsubst-rendered YAMLs (namespace, ServiceAccount, weather-api, Ollama, llm-agent, LoadBalancer).
  • references/ — SKU sizing, Workload Identity primer, cross-tenant federation, post-deploy manual steps, troubleshooting, non-Azure k8s portability notes.

• .claude/skills/teardown-agent-aks-dev/ — matching teardown skill.

Architecture highlights

• Secretless. Agent pod uses Azure Workload Identity (federated identity credential on the Blueprint app). No client secret in-cluster.
• Federation subject: system:serviceaccount:agentid:agent-sa, audience api://AzureADTokenExchange, issuer = the AKS cluster's OIDC URL.
• Cross-tenant supported. The Entra tenant (Blueprint + Agent apps) and the Azure subscription tenant (AKS + ACR) may differ. FIC trust is OIDC-URL-based and tenant-agnostic. Documented in §7.2 and references/cross-tenant-federation.md.
• Default mode is autonomous (app-only). User-OBO via MSAL is documented as an optional add-on (§11.4 — accessed via kubectl port-forward to keep the browser in a secure-context for PKCE).

Validation

End-to-end validated on AKS Standard_D4s_v5 with Ollama llama3.2:3b. Tool-calling reliability table (references/sku-sizing.md) and four > [!WARNING] blocks in the tutorial document the silent-failure modes for under-sized models.

Conventions followed

• Tutorial structure, frontmatter (ms.topic: tutorial), admonition style, and section ordering mirror deploy/azure/container-apps/dev/README.md.
• Skill folder layout matches deploy-agent-aca-dev / teardown-agent-aca-dev.
• No changes to shared sidecar/ source code.

Notes for reviewers

• Sibling skill cross-links (deploy-agent-aca-dev, entra-agent-id-setup) point to skills already in this repo.
• Two small unrelated runtime tweaks for the shared sidecar (Open-Meteo timeout/retry) are intentionally not in this PR — happy to file separately if useful.

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