Update installers for new agents and sync script
Interactive installer:
- Fix agents source path (was claude-complete-package/agents, now agents/)
- Add mkdir -p for each agent category
- Install sync-agents.sh script to ~/.claude/
- Remove duplicate bonus section
Verify script:
- Add checks for new critical agents:
- experiment-tracker
- studio-coach
- agent-updater
- Add sync-agents.sh existence and executable check
