// JWKS rotation, JWKS refresh, and DbResetFixture all mutate process-wide
// state on the shared `missions-sut` container (the JWKS cache, the database,
// the CORS warm-up flag, etc.). xUnit runs different [Collection(...)] groups
// in parallel by default, which races those mutations against any test that
// happens to mint a token or query a row at the same moment. The whole e2e
// surface is one System-Under-Test; serializing the collections is the only
// way to make assertions deterministic.
//
// We still keep [Collection(...)] attributes per class — they continue to
// enforce intra-collection ordering and let xUnit fail fast if two tests in
// the same fixture race. DisableTestParallelization=true switches the
// across-collection scheduling off; intra-collection serialization is the
// default and still applies.
[assembly: Xunit.CollectionBehavior(DisableTestParallelization = true)]