Fix two remaining nits

- server_impl.go: remove stray blank comment line
- cimd_decorator_test.go: add TokenEndpointAuthMethod assertion to
  LoopbackClient test to catch any future regression

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: amirejaz

pkg/authserver/server_impl.go

@@ -107,7 +107,6 @@ func newServer(ctx context.Context, cfg Config, stor storage.Storage, opts ...se
 	// provably safe for the production backends; surfacing a bad backend as
 	// a constructor error keeps misconfiguration fail-loud at boot rather
 	// than at first DCR resolve.
-	//
 	baseStore := unwrapStorage(stor)
 	dcrStore, ok := baseStore.(storage.DCRCredentialStore)
 	if !ok {

pkg/authserver/storage/cimd_decorator_test.go

@@ -383,6 +383,12 @@ func TestBuildFositeClient_LoopbackRedirectWrapsInLoopbackClient(t *testing.T) {
 	}
 	_, ok := got.(loopbackMatcher)
 	assert.True(t, ok, "loopback redirect URI must produce a LoopbackClient")
+
+	// TokenEndpointAuthMethod must be preserved through the LoopbackClient wrapper.
+	oidc, ok := got.(fosite.OpenIDConnectClient)
+	require.True(t, ok, "LoopbackClient must implement fosite.OpenIDConnectClient")
+	assert.Equal(t, "none", oidc.GetTokenEndpointAuthMethod(),
+		"loopback client must preserve TokenEndpointAuthMethod from the OIDC client")
 }
 
 func TestBuildFositeClient_NonLoopbackRedirectReturnsOpenIDConnectClient(t *testing.T) {