The 10 ESLint boundary and restricted-imports probe tests spawned a
fresh eslint subprocess per test (~2.7s each), causing timeout flakes
under load. Replaced with ESLint's Node API (single instance reused
across all tests in a file) — first test pays ~5s init, subsequent
tests ~1.3s each. Added 30s timeout to accommodate the init cost.
Registers schedule URL serializer in parity harness with 18-entry fixture
corpus and fast-check fuzz. 10 URL round-trip integration tests, 6 SEO/
JSON-LD integration tests. Updates barrel and MF expose from stub to real.
6 test files covering start page, flight search, flight details,
URL round-tripping, error handling, and SEO output verification.
All tests use mocked API and SignalR layers with jsdom environment.