Step 1: Replace C++ prototype with Go project scaffolding.

Remove all old C++ source files, proto definitions, CMake build,
clang configs, IDE files, and Trunk linter config. Initialize Go
module (github.com/kisom/sgard) with cobra and yaml.v3 deps.
Set up cobra root command with --repo persistent flag.

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

cmd/sgard/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+)
+
+var repoFlag string
+
+var rootCmd = &cobra.Command{
+	Use:   "sgard",
+	Short: "Shimmering Clarity Gardener: dotfile management",
+}
+
+func defaultRepo() string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return ".sgard"
+	}
+	return filepath.Join(home, ".sgard")
+}
+
+func main() {
+	rootCmd.PersistentFlags().StringVar(&repoFlag, "repo", defaultRepo(), "path to sgard repository")
+
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}