Update agent-buildkit CLI with Phoenix Arise gRPC commands

Add CLI commands for Phoenix Arise gRPC services:

buildkit agent mesh start      # Start agent-mesh gRPC server
buildkit agent tracer start    # Start tracing collector  
buildkit agent route <task>    # Route task using AI
buildkit agent swarm create    # Create agent swarm
buildkit agent swarm join      # Join swarm

Integration files:

• agent-protocol: src/grpc/AgentProtocolServer.ts (✅ done)
• agent-mesh: created with protos
• agent-tracer: PhoenixTracer integrated
• agent-brain: AgentRouter integrated

Dependencies added to agent-protocol/package.json