Add Agents component to installation process

- Created AgentsComponent class in setup/components/agents.py
- Added agents component to features.json configuration
- Updated components __init__.py to import AgentsComponent
- Added agents to "all" components list in install.py
- Updated developer and quick installation profiles to include agents
- Agents component installs 13 specialized AI agent files to ~/.claude/agents/

The 13 specialized agents (system-architect, frontend-specialist, security-auditor,
etc.) are now properly exposed in the installation process, aligning with V4 Beta's
marketing of "13 specialized agents with domain expertise".

Users can now:
- Install agents via --components agents or --components all
- See agents in interactive component selection menu
- Get agents included in developer and quick installation profiles

🤖 Generated with [Claude Code](https://claude.ai/code)

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

config/features.json

@@ -36,6 +36,15 @@
       "enabled": true,
       "required_tools": ["uvx", "python3", "claude_cli"]
     },
+    "agents": {
+      "name": "agents",
+      "version": "4.0.0",
+      "description": "13 specialized AI agents with domain expertise and intelligent routing",
+      "category": "agents",
+      "dependencies": ["core"],
+      "enabled": true,
+      "required_tools": []
+    },
     "hooks": {
       "name": "hooks",
       "version": "2.0.0",