Add README files and diagrams across repository

labs/README.md

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+# labs
+
+This directory collects hands-on lab areas used for experimentation and skill development. It complements the production-style tooling elsewhere in the repository by separating exploratory work from operational examples.
+
+## Diagram
+
+```mermaid
+flowchart TD
+  A["labs"] --> B["docker"]
+  A --> C["kubernetes"]
+  A --> D["terraform"]
+  A --> E["networking"]
+  A --> F["ci-cd"]
+```
+
+## Scope
+
+- `docker` - container runtime and image workflow practice.
+- `kubernetes` - orchestration and workload experiments.
+- `terraform` - infrastructure-as-code exercises.
+- `networking` - connectivity and protocol-focused labs.
+- `ci-cd` - pipeline and delivery automation practice.
+
+## Notes
+
+- These folders are intentionally separate from `infra-run` to keep experiments isolated from the operational core.

labs/ci-cd/README.md

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+# labs/ci-cd
+
+This folder is intended for CI/CD experiments such as pipeline layouts, validation jobs, artifact flows, and deployment automation patterns.
+
+## Diagram
+
+```mermaid
+flowchart LR
+  A["ci-cd"] --> B["Build"]
+  A --> C["Test"]
+  A --> D["Package"]
+  A --> E["Deploy"]
+```
+
+## Notes
+
+- The directory is currently a placeholder.
+- It provides a dedicated area for delivery automation concepts outside the main operations toolkits.

labs/docker/README.md

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+# labs/docker
+
+This folder is reserved for Docker-focused lab work. It is intended for image builds, container runtime testing, compose workflows, and lightweight environment simulations.
+
+## Diagram
+
+```mermaid
+flowchart LR
+  A["docker"] --> B["Dockerfiles"]
+  A --> C["Compose stacks"]
+  A --> D["Container debugging"]
+```
+
+## Notes
+
+- The directory currently contains only a placeholder file.
+- It represents a sandbox for container workflows rather than finalized portfolio tooling.

labs/kubernetes/README.md

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+# labs/kubernetes
+
+This folder is intended for Kubernetes lab work such as manifests, troubleshooting exercises, and orchestration experiments.
+
+## Diagram
+
+```mermaid
+flowchart LR
+  A["kubernetes"] --> B["Workloads"]
+  A --> C["Services"]
+  A --> D["Ingress and networking"]
+  A --> E["Cluster troubleshooting"]
+```
+
+## Notes
+
+- The directory is currently a placeholder.
+- It keeps orchestration experiments separate from the production-style script content.

labs/networking/README.md

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+# labs/networking
+
+This folder is reserved for networking-focused exercises. It can hold examples around routing, DNS, ports, packet flow, and host-to-host diagnostics.
+
+## Diagram
+
+```mermaid
+flowchart LR
+  A["networking"] --> B["Routing"]
+  A --> C["DNS"]
+  A --> D["Firewall and ports"]
+  A --> E["Connectivity tests"]
+```
+
+## Notes
+
+- The directory is currently a placeholder.
+- It complements the operational network diagnostics already present in `infra-run/scripts/bash/os-healthcheck`.

labs/terraform/README.md

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+# labs/terraform
+
+This folder is intended for Terraform experiments and infrastructure-as-code practice. It is the natural place for module trials, state-handling examples, and environment provisioning exercises.
+
+## Diagram
+
+```mermaid
+flowchart LR
+  A["terraform"] --> B["Modules"]
+  A --> C["Environment configs"]
+  A --> D["Plan and apply workflows"]
+```
+
+## Notes
+
+- The directory currently contains only a placeholder file.
+- It is positioned as a lab space rather than a production-ready IaC stack.