Initial implementation of mcdeploy deployment tool

Single Go binary with five commands:
- build: podman build locally with registry tags + git version
- push: podman push to MCR
- deploy: SSH pull/stop/rm/run on target node
- cert renew: issue TLS cert from Metacrypt via REST API
- status: show container status on a node

Config-driven via TOML service registry describing images,
Dockerfiles, container configs per node. Shells out to podman
for container operations and ssh for remote access.

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

main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var cfgPath string
+
+func main() {
+	root := &cobra.Command{
+		Use:   "mcdeploy",
+		Short: "Metacircular deployment tool",
+	}
+	root.PersistentFlags().StringVarP(&cfgPath, "config", "c", "mcdeploy.toml", "config file path")
+
+	root.AddCommand(buildCommand())
+	root.AddCommand(pushCommand())
+	root.AddCommand(deployCommand())
+	root.AddCommand(certCommand())
+	root.AddCommand(statusCommand())
+
+	if err := root.Execute(); err != nil {
+		os.Exit(1)
+	}
+}
+
+func loadCfg() (*Config, error) {
+	return LoadConfig(cfgPath)
+}