server: selfupdate must normalize namespaced tags; build-status: pipeline green

Release tags are server-v1.2.3 but binaries are stamped v1.2.3 — the raw
comparison would re-download the current version on every check.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server/internal/selfupdate/selfupdate.go

@@ -49,7 +49,11 @@ func Run(api, currentVersion string) error {
 	if err := json.NewDecoder(resp.Body).Decode(&rel); err != nil {
 		return err
 	}
-	if rel.TagName == "" || rel.TagName == currentVersion {
+	// Tags are namespaced (server-v1.2.3) but binaries are stamped with the
+	// bare version (v1.2.3) — compare the normalized forms or the updater
+	// would re-download the same version forever.
+	latest := strings.TrimPrefix(rel.TagName, "server-")
+	if rel.TagName == "" || latest == currentVersion {
 		fmt.Printf("already current (%s)\n", currentVersion)
 		return nil
 	}