Fix typeName panic for interface type parameters

reflect.TypeOf on a nil interface value returns nil, causing a
panic when Kind() is called. Use reflect.TypeFor[T]() instead,
which resolves the type directly from the type parameter.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/agent/typed.go

@@ -69,8 +69,7 @@ func RunTyped[T any](
 }
 
 func typeName[T any]() string {
-	var zero T
-	t := reflect.TypeOf(zero)
+	t := reflect.TypeFor[T]()
 	if t.Kind() == reflect.Pointer {
 		t = t.Elem()
 	}

pkg/agent/typed_test.go

@@ -120,6 +120,24 @@ func TestTypeName(t *testing.T) {
 			assert.Equal(t, "status", typeName[Status]())
 		},
 	)
+
+	t.Run(
+		"any interface returns output",
+		func(t *testing.T) {
+			t.Parallel()
+
+			assert.Equal(t, "output", typeName[any]())
+		},
+	)
+
+	t.Run(
+		"named interface returns lowercased name",
+		func(t *testing.T) {
+			t.Parallel()
+
+			assert.Equal(t, "error", typeName[error]())
+		},
+	)
 }
 
 func TestRunTyped(t *testing.T) {