feat: cli migrate to cobra with subcommands (#550)

* feat: migrate CLI to cobra with dump/list/version subcommands (#546)
* fix: remove residual duckduckgo references and add README/LICENSE to release archives
* fix: address PR review feedback from Copilot

cmd/hack-browser-data/version.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"runtime/debug"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	version   = "dev"
+	commit    = "none"
+	buildDate = "unknown"
+)
+
+func versionCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "version",
+		Short: "Print version information",
+		Run: func(cmd *cobra.Command, _ []string) {
+			resolveVersionFromBuildInfo()
+			fmt.Fprintf(cmd.OutOrStdout(), "hack-browser-data %s\n  commit: %s\n  built:  %s\n",
+				version, commit, buildDate)
+		},
+	}
+}
+
+func resolveVersionFromBuildInfo() {
+	if version != "dev" {
+		return
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+	if info.Main.Version != "" && info.Main.Version != "(devel)" {
+		version = info.Main.Version
+	}
+	for _, s := range info.Settings {
+		switch s.Key {
+		case "vcs.revision":
+			if len(s.Value) > 8 {
+				commit = s.Value[:8]
+			} else if s.Value != "" {
+				commit = s.Value
+			}
+		case "vcs.time":
+			if s.Value != "" {
+				buildDate = s.Value
+			}
+		}
+	}
+}