delete Greeter interface

make it canonic Go

cmd/app/main.go

@@ -42,7 +42,7 @@ func showGreeting() {
 	}).Info("starting up")
 
 	// ── Services ──────────────────────────────────────────────────────────────
-	var greetSvc greeter.Greeter = greeter.New(log)
+	greetSvc := greeter.New(log)
 
 	// ── Example usage ─────────────────────────────────────────────────────────
 	msg := greetSvc.Greet(cfg.Greeter.Name).Expect("greeting")

internal/greeter/greeter.go

@@ -14,12 +14,6 @@ import (
 	"gitea.djmil.dev/go/template/pkg/result"
 )
 
-// Greeter produces a greeting for a given name.
-// The interface is what other packages should depend on — never the concrete type.
-type Greeter interface {
-	Greet(name string) result.Expect[string]
-}
-
 // Service is the concrete implementation.
 type Service struct {
 	log *logger.Logger