feat(setup): support CodeBuddy as a setup client (#2492)

Register rea in the global ~/.codebuddy/mcp.json through a new codebuddy
entry in SUPPORTED_CLIENT_DEFINITIONS (json dialect, ~/.codebuddy marker,
~/.codebuddy/skills skill directory). Document the client and cover
registration and uninstall with boundary tests. Loading, the bundled
skill, and real REA tool calls were verified in the CodeBuddy client.

src/application/SupportedClients.ts

@@ -588,6 +588,14 @@ export const SUPPORTED_CLIENT_DEFINITIONS = [
     markerPath: [".cursor"],
     format: "json",
   },
+  {
+    name: "codebuddy",
+    displayName: "CodeBuddy",
+    skillPath: [".codebuddy", "skills"],
+    configPath: [".codebuddy", "mcp.json"],
+    markerPath: [".codebuddy"],
+    format: "json",
+  },
   {
     name: "gemini_cli",
     displayName: "Gemini CLI",