* `test/e2e` -> `test/e2e-selenium`

* add Cypress

* ESLint fixes

* MOAR cypress

* `integration` -> `tests`

* wire Cypress up to a hot e2e server

* linter fixes

* don't run in CI

* test(e2e): modify e2e hot server to peacefully coexist with dev server

* tests: add failing e2e test case

* fix: use originalOperationId for layout targeting, if available

* feat: `onComplete` config option

* tests(e2e): add case for onComplete option