fix: improve auto-detect JSON escaping and add test components

- Fix quote escaping in auto-detect-components.sh using jq --arg
- Auto-detected and added 5 new components to registry:
  * agent:codebase-agent
  * command:commit-openagents
  * command:prompt-optimizer
  * command:test-new-command (test file)
  * context:subagent-template
  * context:orchestrator-template

All components available for individual installation.
Registry validation: 50/50 paths valid ✓