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>

setup/operations/install.py

@@ -138,7 +138,7 @@ def get_components_to_install(args: argparse.Namespace, registry: ComponentRegis
     # Explicit components specified
     if args.components:
         if 'all' in args.components:
-            return ["core", "commands", "mcp"]  # hooks removed - not yet implemented
+            return ["core", "commands", "agents", "mcp"]  # hooks removed - not yet implemented
         return args.components
     
     # Profile-based selection