Add validation tests to detect run configuration drift

- Add spring-boot-starter-test dependency for JUnit Jupiter
- Validate main class exists and matches run config reference
- Validate module name matches pom.xml artifactId
- Validate schema.sql contains active column
- Prevents configuration breakage from refactoring
- Fails with clear messages pointing to which configs need updates

All 5 tests passing.

pom.xml

@@ -80,6 +80,12 @@
             <version>2.3.0</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <build>