docs: add ADR index workflow, standardize all ADR formats

- Add Gitea Action to auto-update README badges and ADR table on push
- Standardize 8 ADRs from heading-style to inline metadata format
- Add shields.io badges for ADR counts (total/accepted/proposed)
- Replace static directory listing with linked ADR table in README
- Accept ADR-0030 (MFA/YubiKey strategy)

README.md

@@ -7,6 +7,10 @@
 [![Flux](https://img.shields.io/badge/GitOps-Flux-blue?logo=flux)](https://fluxcd.io)
 [![License](https://img.shields.io/badge/License-MIT-green)](LICENSE)
 
+<!-- ADR-BADGES-START -->
+![ADR Count](https://img.shields.io/badge/ADRs-37_total-blue?logo=bookstack) ![Accepted](https://img.shields.io/badge/accepted-35-brightgreen) ![Proposed](https://img.shields.io/badge/proposed-1-yellow)
+<!-- ADR-BADGES-END -->
+
 ## 📖 Quick Navigation
 
 | Document | Purpose |
@@ -77,15 +81,55 @@ homelab-design/
 ├── DOMAIN-MODEL.md                    # Core entities
 ├── CODING-CONVENTIONS.md              # Patterns & practices
 ├── GLOSSARY.md                        # Terminology
-├── decisions/                         # ADRs
-│   ├── 0000-template.md
-│   ├── 0001-record-architecture-decisions.md
-│   ├── 0002-use-talos-linux.md
-│   └── ...
+├── decisions/                         # Architecture Decision Records
 ├── specs/                             # Feature specifications
 └── diagrams/                          # Additional diagrams
 ```
 
+### Architecture Decision Records
+
+<!-- ADR-TABLE-START -->
+| # | Decision | Status | Date |
+|---|----------|--------|------|
+| 0001 | [Record Architecture Decisions](decisions/0001-record-architecture-decisions.md) | ✅ accepted | 2025-11-30 |
+| 0002 | [Use Talos Linux for Kubernetes Nodes](decisions/0002-use-talos-linux.md) | ✅ accepted | 2025-11-30 |
+| 0003 | [Use NATS for AI/ML Messaging](decisions/0003-use-nats-for-messaging.md) | ✅ accepted | 2025-12-01 |
+| 0004 | [Use MessagePack for NATS Messages](decisions/0004-use-messagepack-for-nats.md) | ✅ accepted | 2025-12-01 |
+| 0005 | [Multi-GPU Heterogeneous Strategy](decisions/0005-multi-gpu-strategy.md) | ✅ accepted | 2025-12-01 |
+| 0006 | [GitOps with Flux CD](decisions/0006-gitops-with-flux.md) | ✅ accepted | 2025-11-30 |
+| 0007 | [Use KServe for ML Model Serving](decisions/0007-use-kserve-for-inference.md) | ♻️ superseded by ADR-0011 | 2025-12-15 |
+| 0008 | [Use Milvus for Vector Storage](decisions/0008-use-milvus-for-vectors.md) | ✅ accepted | 2025-12-15 |
+| 0009 | [Dual Workflow Engine Strategy](decisions/0009-dual-workflow-engines.md) | ✅ accepted | 2026-01-15 |
+| 0010 | [Use Envoy Gateway for Ingress](decisions/0010-use-envoy-gateway.md) | ✅ accepted | 2025-12-01 |
+| 0011 | [Use KubeRay as Unified GPU Backend](decisions/0011-kuberay-unified-gpu-backend.md) | ✅ accepted | 2026-02-02 |
+| 0012 | [Use uv for Python Development](decisions/0012-use-uv-for-python-development.md) | ✅ accepted | 2026-02-02 |
+| 0013 | [Use Gitea Actions for CI/CD](decisions/0013-gitea-actions-for-ci.md) | ✅ accepted | 2026-02-02 |
+| 0014 | [Docker Build Best Practices](decisions/0014-docker-build-best-practices.md) | ✅ accepted | 2026-02-02 |
+| 0015 | [CI Notifications and Semantic Versioning](decisions/0015-ci-notifications-and-semantic-versioning.md) | ✅ accepted | 2026-02-02 |
+| 0016 | [Affine Email Verification Strategy](decisions/0016-affine-email-verification-strategy.md) | 📝 proposed | 2026-02-04 |
+| 0017 | [Secrets Management Strategy](decisions/0017-secrets-management-strategy.md) | ✅ accepted | 2026-02-04 |
+| 0018 | [Security Policy Enforcement](decisions/0018-security-policy-enforcement.md) | ✅ accepted | 2026-02-04 |
+| 0019 | [Python Module Deployment Strategy](decisions/0019-handler-deployment-strategy.md) | ✅ accepted | 2026-02-02 |
+| 0020 | [Internal Registry URLs for CI/CD](decisions/0020-internal-registry-for-cicd.md) | ✅ accepted | 2026-02-02 |
+| 0021 | [Notification Architecture](decisions/0021-notification-architecture.md) | ✅ accepted | 2026-02-04 |
+| 0022 | [ntfy-Discord Bridge Service](decisions/0022-ntfy-discord-bridge.md) | ✅ accepted | 2026-02-04 |
+| 0023 | [Valkey for ML Inference Caching](decisions/0023-valkey-ml-caching.md) | ✅ accepted | 2026-02-04 |
+| 0024 | [Ray Repository Structure](decisions/0024-ray-repository-structure.md) | ✅ accepted | 2026-02-03 |
+| 0025 | [Observability Stack Architecture](decisions/0025-observability-stack.md) | ✅ accepted | 2026-02-04 |
+| 0026 | [Tiered Storage Strategy](decisions/0026-storage-strategy.md) | ✅ accepted | 2026-02-04 |
+| 0027 | [Database Strategy with CloudNativePG](decisions/0027-database-strategy.md) | ✅ accepted | 2026-02-04 |
+| 0028 | [Authentik Single Sign-On Strategy](decisions/0028-authentik-sso-strategy.md) | ✅ accepted | 2026-02-04 |
+| 0029 | [Authentik User Registration Workflow](decisions/0029-authentik-user-registration-workflow.md) | ✅ accepted | 2026-02-04 |
+| 0030 | [MFA and Yubikey Strategy](decisions/0030-mfa-yubikey-strategy.md) | ✅ accepted | 2026-02-04 |
+| 0031 | [Gitea CI/CD Pipeline Strategy](decisions/0031-gitea-cicd-strategy.md) | ✅ accepted | 2026-02-04 |
+| 0032 | [Velero Backup and Disaster Recovery](decisions/0032-velero-backup-strategy.md) | ✅ accepted | 2026-02-05 |
+| 0033 | [Data Analytics Platform Architecture](decisions/0033-data-analytics-platform.md) | ✅ accepted | 2026-02-05 |
+| 0034 | [Volcano Batch Scheduling Strategy](decisions/0034-volcano-batch-scheduling.md) | ✅ accepted | 2026-02-05 |
+| 0035 | [ARM64 Raspberry Pi Worker Strategy](decisions/0035-arm64-worker-strategy.md) | ✅ accepted | 2026-02-05 |
+| 0036 | [Automated Dependency Updates with Renovate](decisions/0036-renovate-dependency-updates.md) | ✅ accepted | 2026-02-05 |
+| 0037 | [Node Naming Conventions](decisions/0037-node-naming-conventions.md) | ✅ accepted | 2026-02-05 |
+<!-- ADR-TABLE-END -->
+
 ## 🔗 Related Repositories
 
 | Repository | Purpose |
@@ -102,4 +146,4 @@ homelab-design/
 
 ---
 
-*Last updated: 2026-02-01*
+*Last updated: 2026-02-09*