docs: rebuild KB in OKF v0.1 with live-verified facts

Copy of the legacy ~/.pi/agent/docs tree rebuilt as the command-center
knowledge base: concept files promoted to path identity, index listings
stripped of frontmatter, all wikilinks/relative links resolved, every
checkable claim verified against the live fleet (Dankserver = Ryzen 7
7700X + RTX 3090; Strix Halo is Dankclaw), unverifiable claims tagged.
kb-lint exits 0.

omp-docs/engineering/infra/index.md

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+# Infrastructure and Cloud
+
+Current (2025/2026) best practices for infrastructure as code, containers, orchestration, and cloud providers.
+
+## Topics
+
+* [Terraform and OpenTofu](terraform.md) - IaC modules, state, backends, and orchestration.
+* [Docker and Podman](containers.md) - BuildKit, multi-stage builds, rootless, and pods.
+* [Kubernetes](kubernetes.md) - Helm, k3s, k0s, and Talos.
+* [Cloud Providers](cloud.md) - AWS, DigitalOcean, and Hetzner.
+
+## See Also
+
+* [Engineering](../index.md) - The parent area.
+* [SDLC and Tooling](../sdlc.md)