diff --git a/apps/api/internal/auth/core_independence_test.go b/apps/api/internal/auth/core_independence_test.go
new file mode 100644
index 0000000..2aa6005
--- /dev/null
+++ b/apps/api/internal/auth/core_independence_test.go
@@ -0,0 +1,63 @@
+package auth
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"slices"
+	"strings"
+	"testing"
+)
+
+func TestGatewaySourceDoesNotDependOnAuthenticationCoreVocabulary(t *testing.T) {
+	_, currentFile, _, ok := runtime.Caller(0)
+	if !ok {
+		t.Fatal("resolve current test file")
+	}
+	repositoryRoot := filepath.Clean(filepath.Join(filepath.Dir(currentFile), "..", "..", "..", ".."))
+	appsRoot := filepath.Join(repositoryRoot, "apps")
+	forbiddenMarkers := []string{
+		strings.ToLower("key" + "cloak"),
+		"/rea" + "lms/",
+	}
+	sourceExtensions := []string{".go", ".js", ".json", ".ts", ".tsx", ".yaml", ".yml"}
+	skippedDirectories := []string{"coverage", "dist", "node_modules", "test-results"}
+	var violations []string
+
+	err := filepath.WalkDir(appsRoot, func(filePath string, entry os.DirEntry, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if entry.IsDir() {
+			if filePath != appsRoot && slices.Contains(skippedDirectories, entry.Name()) {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+		if !slices.Contains(sourceExtensions, strings.ToLower(filepath.Ext(entry.Name()))) {
+			return nil
+		}
+		content, readErr := os.ReadFile(filePath)
+		if readErr != nil {
+			return readErr
+		}
+		lowerContent := strings.ToLower(string(content))
+		for _, marker := range forbiddenMarkers {
+			if strings.Contains(lowerContent, marker) {
+				relativePath, relativeErr := filepath.Rel(repositoryRoot, filePath)
+				if relativeErr != nil {
+					return relativeErr
+				}
+				violations = append(violations, filepath.ToSlash(relativePath))
+				break
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("scan Gateway sources: %v", err)
+	}
+	if len(violations) > 0 {
+		t.Fatalf("Gateway source contains authentication-core-specific vocabulary: %s", strings.Join(violations, ", "))
+	}
+}
diff --git a/apps/api/internal/store/oidc_users_integration_test.go b/apps/api/internal/store/oidc_users_integration_test.go
index 5a41b77..3a3aff7 100644
--- a/apps/api/internal/store/oidc_users_integration_test.go
+++ b/apps/api/internal/store/oidc_users_integration_test.go
@@ -31,7 +31,7 @@ func TestResolveOrProvisionOIDCUserLifecycleAndConcurrency(t *testing.T) {
 	suffix := time.Now().UTC().Format("20060102150405.000000000")
 	subject := "platform-jit-" + suffix
 	input := ResolveOrProvisionOIDCUserInput{
-		Issuer:              "https://auth.test.example/realms/easyai",
+		Issuer:              "https://auth.test.example/issuer/shared",
 		Subject:             subject,
 		Username:            "jit-user-" + suffix,
 		Roles:               []string{"basic"},
@@ -176,7 +176,7 @@ func TestResolveOrProvisionOIDCUserRejectsMissingMappingWithoutWrites(t *testing
 
 	subject := "platform-jit-missing-" + time.Now().UTC().Format("20060102150405.000000000")
 	input := ResolveOrProvisionOIDCUserInput{
-		Issuer:           "https://auth.test.example/realms/easyai",
+		Issuer:           "https://auth.test.example/issuer/shared",
 		Subject:          subject,
 		Username:         "missing-user",
 		Roles:            []string{"basic"},
@@ -239,7 +239,7 @@ RETURNING id::text`, tenantKey, groupID).Scan(&tenantID); err != nil {
 }
 
 func TestOIDCUserKeyIsStableAndDoesNotExposeClaims(t *testing.T) {
-	issuer := "https://auth.test.example/realms/easyai"
+	issuer := "https://auth.test.example/issuer/shared"
 	subject := "platform-sensitive-subject"
 	first := deriveOIDCUserKey(issuer, subject)
 	second := deriveOIDCUserKey(issuer+"/", subject)
diff --git a/apps/api/internal/store/security_events_integration_test.go b/apps/api/internal/store/security_events_integration_test.go
index cef4e2b..8131e50 100644
--- a/apps/api/internal/store/security_events_integration_test.go
+++ b/apps/api/internal/store/security_events_integration_test.go
@@ -38,7 +38,7 @@ func TestSecurityEventWatermarkVerificationAndFallbackLifecycle(t *testing.T) {
 	}
 	defer db.Close()
 	issuer := "https://auth.test.example/ssf"
-	subjectIssuer := "https://auth.test/realms/tenant"
+	subjectIssuer := "https://auth.test/issuer/shared"
 	audience := "urn:easyai:ssf:receiver:" + uuid.NewString()
 	streamID, tenantID, subject := uuid.NewString(), uuid.NewString(), uuid.NewString()
 	t.Cleanup(func() {