Update project and agent context files

- CLAUDE.md: Concise dev context, references README/REQUIREMENTS
- groups/CLAUDE.md: Proper agent identity for Andy
- groups/main/CLAUDE.md: Add agent identity, keep admin context
- package.json: Update description
- setup skill: Note to update name in multiple places

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "nanoclaw",
   "version": "1.0.0",
-  "description": "Personal Claude assistant via WhatsApp",
+  "description": "Personal Claude assistant. Lightweight, secure, customizable.",
   "type": "module",
   "main": "dist/index.js",
   "scripts": {