feat(radar): add radar Kubernetes UI package v1.5.10

Add radar v1.5.10 — a modern Kubernetes visibility tool providing
topology, event timeline, service traffic, resource browsing, Helm
management, and GitOps support.

Uses pre-built binary from GitHub releases.

Closes: nix-overlay-2lr

README.md

@@ -19,6 +19,7 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | `mcp-gateway` | Universal Model Context Protocol gateway that sits between AI client and MCP tools/servers | MCP Servers |
 | `skillsmcp` | MCP server that exposes Agent Skills to AI agents via the Model Context Protocol | MCP Servers |
 | `kubernetes-mcp-server` | Model Context Protocol (MCP) server for Kubernetes and OpenShift | MCP Servers |
+| `radar` | Modern Kubernetes visibility — topology, event timeline, service traffic, resource browsing, Helm management, and GitOps support | Kubernetes |
 
 ## Usage
 
@@ -110,6 +111,7 @@ nix-overlay/
 │   ├── goose-cli/              # Goose AI agent CLI
 │   ├── graphify/               # Knowledge graph generator for code folders
 │   ├── mcp-gateway/            # MCP protocol gateway
+│   ├── radar/                    # Kubernetes UI (topology, timeline, Helm, GitOps)
 │   └── skillsmcp/              # MCP server for Agent Skills
 └── README.md
 ```