docs: complete v2.0 CI/CD and observability research
Files:
- STACK-v2-cicd-observability.md (ArgoCD, Prometheus, Loki, Alloy)
- FEATURES.md (updated with CI/CD and observability section)
- ARCHITECTURE.md (updated with v2.0 integration architecture)
- PITFALLS-CICD-OBSERVABILITY.md (14 critical/moderate/minor pitfalls)
- SUMMARY-v2-cicd-observability.md (synthesis with roadmap implications)
Key findings:
- Stack: kube-prometheus-stack + Loki monolithic + Alloy (Promtail EOL March 2026)
- Architecture: 3-phase approach - GitOps first, observability second, CI tests last
- Critical pitfall: ArgoCD TLS redirect loop, Loki disk exhaustion, k3s metrics config
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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