Consolidated OpenShift deployment guide

[pavelanni]

Summary

Deployment knowledge is scattered across multiple files:

• docs/demo/README.md — demo walkthrough
• examples/nps-explorer/README.md — NPS-specific deploy steps
• examples/skill-playground/README.md — playground-specific steps
• docs/demo/image-volume-scc.yaml — SCC for image volumes
• docs/demo/llm-secret.yaml — LLM secret template

A new user has to piece together information from all of these to
deploy an agent on OpenShift. The SCC setup is a recurring pain point
that trips up anyone starting in a new namespace.

Proposed

Create docs/openshift-deploy-guide.md covering the full path:

1. Namespace setup — create project, set context
2. SCC configuration — when needed (image volumes), how to apply,
   which ServiceAccount to bind
3. LLM secret — provider options (Anthropic/OpenAI/LiteLLM)
4. Agent deployment — ConfigMap, skills, Deployment, Service, Route
5. Verification — health check, test request, a2a CLI
6. Troubleshooting — common issues (SCC denied, missing secret,
   image pull errors, timeout on LLM calls)

Depends on #80 (simplified args make the deployment steps cleaner).