Add langgraph4j module: a loan-approval graph with checkpoints and human-in-the-loop on LangGraph4j 1.9.5

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjfyTgmERTWLqzafu34Cth

pom.xml

@@ -14,6 +14,7 @@
     <module>a2a</module>
     <module>jlama</module>
     <module>onnx-djl</module>
+    <module>langgraph4j</module>
   </modules>
 
   <properties>
@@ -24,6 +25,8 @@
     <a2a.sdk.version>1.0.0.Alpha3</a2a.sdk.version>
     <jlama.version>0.8.4</jlama.version>
     <djl.version>0.38.0</djl.version>
+    <!-- Verified on Maven Central 2026-10-14 -->
+    <langgraph4j.version>1.9.5</langgraph4j.version>
     <onnxruntime.version>1.31.0</onnxruntime.version>
     <spring-boot.version>4.1.1</spring-boot.version>
     <junit.version>6.1.3</junit.version>