feat: bootstrap module and cobra root command

internal/cli/root.go

@@ -0,0 +1,13 @@
+// Package cli provides the cobra command tree for harness-sync.
+package cli
+
+import "github.com/spf13/cobra"
+
+func NewRoot(version string) *cobra.Command {
+	return &cobra.Command{
+		Use:          "harness-sync",
+		Short:        "Sync skills, agents, MCP, and LLM endpoints across LLM harnesses",
+		Version:      version,
+		SilenceUsage: true,
+	}
+}