diff --git a/pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/config/InvalidStartConfigurationException.java b/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/InvalidStartConfigurationException.java
similarity index 89%
rename from pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/config/InvalidStartConfigurationException.java
rename to pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/InvalidStartConfigurationException.java
index 8d844c8..815fb5b 100644
--- a/pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/config/InvalidStartConfigurationException.java
+++ b/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/InvalidStartConfigurationException.java
@@ -1,4 +1,4 @@
-package de.gecheckt.pdf.umbenenner.application.config;
+package de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation;
 
 /**
  * Exception thrown when startup configuration validation fails.
diff --git a/pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/config/StartConfigurationValidator.java b/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/StartConfigurationValidator.java
similarity index 98%
rename from pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/config/StartConfigurationValidator.java
rename to pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/StartConfigurationValidator.java
index ce7ae50..0b1785c 100644
--- a/pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/config/StartConfigurationValidator.java
+++ b/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/StartConfigurationValidator.java
@@ -1,5 +1,6 @@
-package de.gecheckt.pdf.umbenenner.application.config;
+package de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation;
 
+import de.gecheckt.pdf.umbenenner.application.config.StartConfiguration;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
diff --git a/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/package-info.java b/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/package-info.java
new file mode 100644
index 0000000..882966a
--- /dev/null
+++ b/pdf-umbenenner-adapter-out/src/main/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/package-info.java
@@ -0,0 +1,8 @@
+/**
+ * Bootstrap-phase technical configuration validation.
+ * <p>
+ * Handles startup configuration validation before the batch application begins.
+ * Validates mandatory fields, numeric ranges, URI schemes, and path existence.
+ * Technical responsibility that does not belong to the application layer.
+ */
+package de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation;
diff --git a/pdf-umbenenner-application/src/test/java/de/gecheckt/pdf/umbenenner/application/config/StartConfigurationValidatorTest.java b/pdf-umbenenner-adapter-out/src/test/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/StartConfigurationValidatorTest.java
similarity index 99%
rename from pdf-umbenenner-application/src/test/java/de/gecheckt/pdf/umbenenner/application/config/StartConfigurationValidatorTest.java
rename to pdf-umbenenner-adapter-out/src/test/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/StartConfigurationValidatorTest.java
index 0d70e83..6cb8afe 100644
--- a/pdf-umbenenner-application/src/test/java/de/gecheckt/pdf/umbenenner/application/config/StartConfigurationValidatorTest.java
+++ b/pdf-umbenenner-adapter-out/src/test/java/de/gecheckt/pdf/umbenenner/adapter/out/bootstrap/validation/StartConfigurationValidatorTest.java
@@ -1,5 +1,6 @@
-package de.gecheckt.pdf.umbenenner.application.config;
+package de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation;
 
+import de.gecheckt.pdf.umbenenner.application.config.StartConfiguration;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
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 c168473..ebf1101 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
@@ -9,6 +9,8 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import de.gecheckt.pdf.umbenenner.adapter.in.cli.SchedulerBatchCommand;
+import de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation.InvalidStartConfigurationException;
+import de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation.StartConfigurationValidator;
 import de.gecheckt.pdf.umbenenner.adapter.out.configuration.PropertiesConfigurationPortAdapter;
 import de.gecheckt.pdf.umbenenner.adapter.out.fingerprint.Sha256FingerprintAdapter;
 import de.gecheckt.pdf.umbenenner.adapter.out.lock.FilesystemRunLockPortAdapter;
@@ -18,9 +20,7 @@ import de.gecheckt.pdf.umbenenner.adapter.out.sqlite.SqliteDocumentRecordReposit
 import de.gecheckt.pdf.umbenenner.adapter.out.sqlite.SqliteProcessingAttemptRepositoryAdapter;
 import de.gecheckt.pdf.umbenenner.adapter.out.sqlite.SqliteSchemaInitializationAdapter;
 import de.gecheckt.pdf.umbenenner.adapter.out.sqlite.SqliteUnitOfWorkAdapter;
-import de.gecheckt.pdf.umbenenner.application.config.InvalidStartConfigurationException;
 import de.gecheckt.pdf.umbenenner.application.config.StartConfiguration;
-import de.gecheckt.pdf.umbenenner.application.config.StartConfigurationValidator;
 import de.gecheckt.pdf.umbenenner.application.port.in.BatchRunOutcome;
 import de.gecheckt.pdf.umbenenner.application.port.in.BatchRunProcessingUseCase;
 import de.gecheckt.pdf.umbenenner.application.port.out.ConfigurationPort;
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 9062678..31e43be 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
@@ -1,9 +1,9 @@
 package de.gecheckt.pdf.umbenenner.bootstrap;
 
 import de.gecheckt.pdf.umbenenner.adapter.in.cli.SchedulerBatchCommand;
-import de.gecheckt.pdf.umbenenner.application.config.InvalidStartConfigurationException;
+import de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation.InvalidStartConfigurationException;
+import de.gecheckt.pdf.umbenenner.adapter.out.bootstrap.validation.StartConfigurationValidator;
 import de.gecheckt.pdf.umbenenner.application.config.StartConfiguration;
-import de.gecheckt.pdf.umbenenner.application.config.StartConfigurationValidator;
 import de.gecheckt.pdf.umbenenner.application.port.in.BatchRunOutcome;
 import de.gecheckt.pdf.umbenenner.application.port.in.BatchRunProcessingUseCase;
 import de.gecheckt.pdf.umbenenner.application.port.out.ConfigurationPort;
@@ -28,7 +28,7 @@ import static org.junit.jupiter.api.Assertions.*;
  * <p>
  * Tests cover the bootstrap orchestration behavior including success path,
  * invalid configuration handling, unexpected failure handling, and the
- * empty-lock-file-path default (M2-F2 fix).
+ * empty-lock-file-path default behavior.
  */
 class BootstrapRunnerTest {