feat: add netssh version and --version

`netssh --version` used to be passed to ssh and failed with
"unknown option -- -". Release builds now embed the tag via
-X main.version; other builds fall back to the module build info.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
             out="dist/netssh_${GOOS}_${GOARCH}"
             echo "→ $out"
             CGO_ENABLED=0 GOOS=$GOOS GOARCH=$GOARCH \
-              go build -trimpath -ldflags="-s -w" \
+              go build -trimpath -ldflags="-s -w -X main.version=${GITHUB_REF_NAME}" \
               -o "$out" ./cmd/netssh
           done
 

cmd/netssh/main.go

@@ -40,6 +40,7 @@ var managedSubcommands = map[string]bool{
 	"completion": true,
 	"__complete": true,
 	"help":       true,
+	"version":    true,
 }
 
 func main() {
@@ -49,6 +50,10 @@ func main() {
 		runTUI()
 		return
 	}
+	if args[0] == "--version" {
+		fmt.Printf("netssh %s\n", buildVersion())
+		return
+	}
 
 	if managedSubcommands[args[0]] {
 		if err := rootCmd().Execute(); err != nil {
@@ -352,7 +357,7 @@ func rootCmd() *cobra.Command {
 		},
 	}
 
-	root.AddCommand(notesCmd(), configureCmd(), searchCmd(), cacheCmd(), aliasCmd(), hookCmd(), shellInitCmd())
+	root.AddCommand(notesCmd(), configureCmd(), searchCmd(), cacheCmd(), aliasCmd(), hookCmd(), shellInitCmd(), versionCmd())
 
 	// cobra builds the "completion" command lazily; force init so we can extend it.
 	root.InitDefaultCompletionCmd()

cmd/netssh/version.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"runtime/debug"
+
+	"github.com/spf13/cobra"
+)
+
+// version is set at build time: -ldflags "-X main.version=v1.2.3".
+var version = ""
+
+// buildVersion falls back to the module version for `go install` builds.
+func buildVersion() string {
+	if version != "" {
+		return version
+	}
+	if info, ok := debug.ReadBuildInfo(); ok && info.Main.Version != "" && info.Main.Version != "(devel)" {
+		return info.Main.Version
+	}
+	return "dev"
+}
+
+func versionCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "version",
+		Short: "Print the netssh version",
+		Args:  cobra.NoArgs,
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Fprintf(cmd.OutOrStdout(), "netssh %s\n", buildVersion())
+		},
+	}
+}