fix: handle errcheck warnings in gpg.go and gpg_test.go, fix gofmt

mfer/scanner_test.go

@@ -352,8 +352,8 @@ func TestIsHiddenPath(t *testing.T) {
 		{"/absolute/.hidden", true},
 		{"./relative", false}, // path.Clean removes leading ./
 		{"a/b/c/.d/e", true},
-		{".", false},          // current directory is not hidden
-		{"/", false},          // root is not hidden
+		{".", false}, // current directory is not hidden
+		{"/", false}, // root is not hidden
 	}
 
 	for _, tt := range tests {