v0.2.0 toml-only, harden concurrency and env export, dep updates

example/main.go

@@ -64,7 +64,7 @@ func main() {
 	log.Println("   (Set environment variable APP_SERVER_PORT=8888)")
 
 	// Create a "target" struct. The builder will automatically populate this
-	// and keep it updated when using `AsStruct()`
+	// once; later `AsStruct()` calls return independent updated snapshots.
 	target := &AppConfig{}
 
 	// Use the builder to chain multiple configuration options
@@ -199,4 +199,4 @@ func printCurrentState(cfg *AppConfig, title string) {
 	fmt.Printf("     Server Log Level: %s\n", cfg.Server.LogLevel)
 	fmt.Printf("     Feature Flags:    %v\n", cfg.FeatureFlags)
 	fmt.Println("   --------------------------------------------------")
-}
+}