feat(03-01): add agent registration controller, config, lifecycle monitor
- AgentRegistryConfig: heartbeat, stale, dead, ping, command expiry settings
- AgentRegistryBeanConfig: wires AgentRegistryService as Spring bean
- AgentLifecycleMonitor: @Scheduled lifecycle check + command expiry sweep
- AgentRegistrationController: POST /register, POST /{id}/heartbeat, GET /agents
- Updated Cameleer3ServerApplication with AgentRegistryConfig
- Updated application.yml with agent-registry section and async timeout
- 7 integration tests: register, re-register, heartbeat, list, filter, invalid status
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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