Add gRPC-based plugin protocol implementation to the AI sidecar, enabling the GitCaddy server to manage it as an external plugin with lifecycle control and health monitoring.
Plugin Protocol Implementation:
- Add plugin.proto with PluginService definition (Initialize, Shutdown, HealthCheck, GetManifest, OnEvent, HandleHTTP)
- Implement PluginServiceImpl gRPC service in C#
- Return manifest declaring AI service capabilities, routes, and required permissions
- Integrate license validation into health checks
- Register plugin service alongside existing AI service
Server Integration:
- Configure Kestrel for HTTP/1.1 + HTTP/2 on port 5000 (enables gRPC + REST)
- Map PluginService gRPC endpoint at /plugin.v1.PluginService
- Enable server to call Initialize on startup, HealthCheck periodically, and Shutdown on graceful stop
This completes Phase 5 of the AI integration, allowing the server's external plugin manager to monitor and control the sidecar's lifecycle instead of relying on manual process management.
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