Binary parameters tests run unsharded on a single runner. With
fullyparallel enabled, all ~755 api4 tests run concurrently, causing
resource exhaustion (too many server instances, WebSocket hubs, and DB
connections). The test binary gets killed after 11 minutes with no
individual test failures — just overwhelmed resources.
Disabling fullyparallel for this specific job lets binary parameters
tests pass while we evaluate moving them to a nightly/weekly schedule.
Co-authored-by: Claude <claude@anthropic.com>