P2.1 + P3.1: Agent skeleton and CLI skeleton

Agent (P2.1): Agent struct with registry DB, runtime, and logger.
gRPC server with TLS 1.3 and MCIAS auth interceptor. Graceful
shutdown on SIGINT/SIGTERM. All RPCs return Unimplemented until
handlers are built in P2.2-P2.9.

CLI (P3.1): Full command tree with all 15 subcommands as stubs
(login, deploy, stop, start, restart, list, ps, status, sync,
adopt, service show/edit/export, push, pull, node list/add/remove).
gRPC dial helper with TLS, CA cert, and bearer token attachment.

Both gates for parallel Phase 2+3 work are now open.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cmd/mcp-agent/main.go

@@ -2,8 +2,11 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"os"
 
+	"git.wntrmute.dev/kyle/mcp/internal/agent"
+	"git.wntrmute.dev/kyle/mcp/internal/config"
 	"github.com/spf13/cobra"
 )
 
@@ -27,7 +30,20 @@ func main() {
 		},
 	})
 
+	root.AddCommand(&cobra.Command{
+		Use:   "server",
+		Short: "Start the agent server",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			cfg, err := config.LoadAgentConfig(cfgPath)
+			if err != nil {
+				return fmt.Errorf("load config: %w", err)
+			}
+			return agent.Run(cfg)
+		},
+	})
+
 	if err := root.Execute(); err != nil {
+		log.Fatal(err)
 		os.Exit(1)
 	}
 }