Add blog post on multi-cluster MCP federation with Kagent

[Devamparikh]

Summary

Adds a technical blog post about using Kagent with Agentgateway Virtual MCP to federate Kubernetes MCP tools from multiple clusters behind a single agent-facing endpoint.

What this covers

• Multi-cluster Kubernetes operations with Kagent
• Agentgateway Virtual MCP as a federation layer
• Cluster-prefixed tool discovery
• Read-only Kubernetes MCP tooling
• Verification checklist and production considerations

Community and safety notes

• Vendor-neutral examples only
• No private infrastructure details
• No credentials, account IDs, internal DNS names, or proprietary names
• Read-only operational workflow emphasized as the default starting point

Testing

• Added the post under src/blogContent
• Added the post entry to src/app/blog/page.tsx
• Added author metadata in src/app/blog/authors.ts
• Added supporting images under public/images
• Ran npm run build
• Verified the new blog route and image assets locally
• Signed commit with DCO