Add Kubernetes migration plan documentation (#24)
## Summary
- Comprehensive phased plan for migrating blumeops services to minikube
- Technical decisions documented: Zot registry, Podman driver, CloudNativePG, Tailscale Operator
- 9 migration phases with verification and rollback procedures
- LaunchAgent absolute path requirements documented
- Observability requirements (zk docs, logging, metrics, dashboards) for new services
## Deployment and Testing
- [x] Plan document created at `docs/k8s-migration.md`
- [ ] Review plan phases for completeness
- [ ] Validate technical decisions align with requirements
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Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/24
Erich Blume
c8433467c1