🐛 fix(bdd): revert PR #26 schema isolation + cache flush + sequential CI tests (#28)

Reverts PR #26 (BDD_SCHEMA_ISOLATION caused empty schemas with no tables, 500 errors). Adds sequential package execution (-p 1) + cache flush AfterScenario. AuthBDD goes from 0/5 PASS to 5/5 PASS deterministically. Parallel BDD deferred as architectural follow-up (requires per-schema migrations + dedicated connection pools).

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

pkg/bdd/suite.go

@@ -115,6 +115,15 @@ func InitializeTestSuite(ctx *godog.TestSuiteContext) {
 				testserver.TraceStateJWTSecretOperation(feature, scenarioKey, "RESET", "ok")
 			}
 
+			// Flush cache after every scenario to prevent cache pollution
+			if flushErr := sharedServer.FlushCache(); flushErr != nil {
+				if isCleanupLoggingEnabled() {
+					log.Warn().Err(flushErr).Msg("CLEANUP: Failed to flush cache after scenario")
+				}
+			} else {
+				testserver.TraceStateCacheOperation(feature, scenarioKey, "FLUSH", "ok")
+			}
+
 			// Clean database after every scenario (only if schema isolation is disabled)
 			if !isSchemaIsolationEnabled() {
 				if cleanupErr := sharedServer.CleanupDatabase(); cleanupErr != nil {