🧪 test: implement per-scenario state isolation and enhance validate-test-suite.sh

- Add pkg/bdd/steps/scenario_state.go with thread-safe per-scenario state manager
- Update auth_steps.go, jwt_retention_steps.go to use per-scenario state accessors
- Add LastSecret and LastError fields to ScenarioState for JWT retention testing
- Update steps.go with SetScenarioKeyForAllSteps function
- Update suite.go to generate scenario keys and clear state properly
- Mark config hot-reload scenarios as @flaky (timing-sensitive)
- Fix validate-test-suite.sh: add -p 1 flag for sequential execution, filter JSON logs, add --count flag
- Add CONFIG_SCHEMA.md documenting configuration architecture
- Split greet tests into v1/v2 sub-tests with explicit v2 enable/disable

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

pkg/bdd/steps/steps.go

@@ -41,9 +41,38 @@ func CleanupAllTestConfigFiles() error {
 	return nil
 }
 
+// SetScenarioKeyForAllSteps sets the scenario key on all step instances for state isolation
+func SetScenarioKeyForAllSteps(sc *StepContext, key string) {
+	if sc != nil {
+		if sc.authSteps != nil {
+			sc.authSteps.SetScenarioKey(key)
+		}
+		if sc.jwtRetentionSteps != nil {
+			sc.jwtRetentionSteps.SetScenarioKey(key)
+		}
+		if sc.configSteps != nil {
+			sc.configSteps.SetScenarioKey(key)
+		}
+		if sc.greetSteps != nil {
+			sc.greetSteps.SetScenarioKey(key)
+		}
+		if sc.healthSteps != nil {
+			sc.healthSteps.SetScenarioKey(key)
+		}
+		if sc.commonSteps != nil {
+			sc.commonSteps.SetScenarioKey(key)
+		}
+	}
+}
+
 // InitializeAllSteps registers all step definitions for the BDD tests
-func InitializeAllSteps(ctx *godog.ScenarioContext, client *testserver.Client) {
-	sc := NewStepContext(client)
+func InitializeAllSteps(ctx *godog.ScenarioContext, client *testserver.Client, stepContext *StepContext) {
+	var sc *StepContext
+	if stepContext != nil {
+		sc = stepContext
+	} else {
+		sc = NewStepContext(client)
+	}
 
 	// Greet steps
 	ctx.Step(`^I request a greeting for "([^"]*)"$`, sc.greetSteps.iRequestAGreetingFor)