diff --git a/.claude/settings.local.json b/.claude/settings.local.json
new file mode 100644
index 0000000..82fd7f0
--- /dev/null
+++ b/.claude/settings.local.json
@@ -0,0 +1,8 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(xargs grep:*)",
+      "Bash(xargs wc:*)"
+    ]
+  }
+}
diff --git a/pdf-umbenenner-bootstrap/src/main/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunner.java b/pdf-umbenenner-bootstrap/src/main/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunner.java
index 3020207..870487b 100644
--- a/pdf-umbenenner-bootstrap/src/main/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunner.java
+++ b/pdf-umbenenner-bootstrap/src/main/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunner.java
@@ -19,7 +19,7 @@ import de.gecheckt.pdf.umbenenner.application.usecase.NoOpRunBatchProcessingUseC
  * <p>
  * AP-005: Integrates configuration loading via PropertiesConfigurationPortAdapter.
  * <p>
- * AP-006: Validates configuration before processing begins, returns exit code 2 on invalid config.
+ * AP-006: Validates configuration before processing begins, returns exit code 1 on invalid config.
  */
 public class BootstrapRunner {
 
@@ -97,7 +97,7 @@ public class BootstrapRunner {
      * AP-005: Wires ConfigurationPort adapter and passes it to the use case.
      * AP-006: Validates configuration before allowing processing to start.
      *
-     * @return exit code: 0 for success, 1 for unexpected failure, 2 for invalid configuration
+     * @return exit code: 0 for success, 1 for invalid configuration or unexpected failure
      */
     public int run() {
         LOG.info("Bootstrap flow started.");
@@ -129,12 +129,12 @@ public class BootstrapRunner {
         } catch (InvalidStartConfigurationException e) {
             // Controlled failure for invalid configuration - log clearly without stack trace
             LOG.error("Configuration validation failed: {}", e.getMessage());
-            return 2;
+            return 1;
         } catch (IllegalStateException e) {
             // Configuration loading failed due to missing/invalid required properties
             // Treat as invalid configuration for controlled failure
             LOG.error("Configuration loading failed: {}", e.getMessage());
-            return 2;
+            return 1;
         } catch (Exception e) {
             LOG.error("Bootstrap failure during startup.", e);
             return 1;
diff --git a/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunnerTest.java b/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunnerTest.java
index c66b358..237eab1 100644
--- a/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunnerTest.java
+++ b/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/BootstrapRunnerTest.java
@@ -46,7 +46,7 @@ class BootstrapRunnerTest {
     }
 
     @Test
-    void run_returnsTwoOnInvalidConfiguration() throws Exception {
+    void run_returnsOneOnInvalidConfiguration() throws Exception {
         // Create a mock configuration port that returns valid config
         ConfigurationPort mockConfigPort = new MockConfigurationPort(tempDir, true);
 
@@ -67,11 +67,11 @@ class BootstrapRunnerTest {
 
         int exitCode = runner.run();
 
-        assertEquals(2, exitCode, "Invalid configuration should return exit code 2");
+        assertEquals(1, exitCode, "Invalid configuration should return exit code 1");
     }
 
     @Test
-    void run_returnsTwoOnConfigurationLoadingFailure() {
+    void run_returnsOneOnConfigurationLoadingFailure() {
         // Create a mock configuration port that throws IllegalStateException
         ConfigurationPort failingConfigPort = () -> {
             throw new IllegalStateException("Simulated configuration loading failure");
@@ -86,7 +86,7 @@ class BootstrapRunnerTest {
 
         int exitCode = runner.run();
 
-        assertEquals(2, exitCode, "Configuration loading failure should return exit code 2");
+        assertEquals(1, exitCode, "Configuration loading failure should return exit code 1");
     }
 
     @Test
diff --git a/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/ExecutableJarSmokeTestIT.java b/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/ExecutableJarSmokeTestIT.java
index db3aedb..2f41635 100644
--- a/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/ExecutableJarSmokeTestIT.java
+++ b/pdf-umbenenner-bootstrap/src/test/java/de/gecheckt/pdf/umbenenner/bootstrap/ExecutableJarSmokeTestIT.java
@@ -156,11 +156,11 @@ class ExecutableJarSmokeTestIT {
     }
 
     /**
-     * Invalid-configuration smoke test: verifies controlled failure with exit code 2.
+     * Invalid-configuration smoke test: verifies controlled failure with exit code 1.
      * <p>
      * Verifies:
      * - java -jar runs against invalid configuration
-     * - Exit code is 2
+     * - Exit code is 1
      * - Startup fails before any processing
      * - Failure is controlled (not a crash/hang)
      * - Error output indicates configuration validation failure
@@ -260,7 +260,7 @@ class ExecutableJarSmokeTestIT {
         System.out.println("[SMOKE-TEST-INVALID] Exit code: " + exitCode);
         System.out.println("[SMOKE-TEST-INVALID] Subprocess stdout/stderr:\n" + outputText);
 
-        assertEquals(2, exitCode, "Invalid configuration should return exit code 2. Output was: " + outputText);
+        assertEquals(1, exitCode, "Invalid configuration should return exit code 1. Output was: " + outputText);
 
         // Verify error output indicates configuration failure
         assertTrue(