This matches when each expected item from the array
is matched to one of the resolved elements, in order.
Note this performs both "sub-array" and "substring" matching.
Drive-by: documentation fixes.
Drive-by: added "selector resolved to 3 elements" log line
when expecting arrays.
- Source now lives at `src/test`.
- Former folio tests live at `tests/playwright-test`.
- We use `src/test/internal.ts` that exposes base test without
Playwright fixtures for most tests (to avoid modifications for now).
- Test types live in `types/testFoo.d.ts`.
- Stable test runner is installed to `tests/config/test-runner` during `npm install`.
- All deps including test-only are now listed in `package.json`.
Non-test deps must also be listed in `build_package.js` to get included.
