Expose version/build metadata and improve provider error messaging

cmd/goaichat/main.go

@@ -10,6 +10,11 @@ import (
 	"github.com/stig/goaichat/internal/config"
 )
 
+var (
+	version    = "dev"
+	buildStamp = ""
+)
+
 func main() {
 	var configPath string
 	flag.StringVar(&configPath, "config", "", "Path to configuration file")
@@ -26,7 +31,12 @@ func main() {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	application := app.New(logger, cfg)
+	application := app.New(
+		logger,
+		cfg,
+		app.WithVersion(version),
+		app.WithBuild(buildStamp),
+	)
 	if err := application.Run(ctx); err != nil {
 		logger.Error("application terminated with error", "error", err)
 		os.Exit(1)