fix(runtime): shutdown hook holds the runtime weakly

Every AssistantRuntime registered a JVM shutdown hook that held the
runtime, and so its whole QInstance, until JVM exit. A host test suite
that builds an instance per test leaked every instance (kof22's suite ran
out of heap). The hook now holds a weak reference.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

qbit-assistant/pom.xml

@@ -114,6 +114,7 @@
             <directory>src/main/resources</directory>
             <filtering>true</filtering>
             <includes>
+               <include>help/*.yaml</include>
                <include>qbit-assistant.properties</include>
             </includes>
          </resource>
@@ -121,6 +122,7 @@
             <directory>src/main/resources</directory>
             <filtering>false</filtering>
             <excludes>
+               <exclude>help/*.yaml</exclude>
                <exclude>qbit-assistant.properties</exclude>
             </excludes>
          </resource>

qbit-assistant/src/main/java/com/kingsrook/qbits/assistant/AssistantRuntime.java

@@ -17,6 +17,7 @@
 package com.kingsrook.qbits.assistant;
 
 
+import java.lang.ref.WeakReference;
 import java.net.InetAddress;
 import java.time.Clock;
 import java.time.Duration;
@@ -178,11 +179,22 @@ public class AssistantRuntime
       this.contextBuilder = new ContextBuilder(config, kernel, toolbox).withKnowledgeTool(knowledgeTool).withBulkLoadTools(bulkLoadTools);
       if(Boolean.TRUE.equals(config.getRegisterShutdownHook()))
       {
+         ///////////////////////////////////////////////////////////////////////
+         // the hook holds the runtime weakly: a runtime (and its QInstance)   //
+         // that is dropped without shutdown() - every test that builds an    //
+         // instance - must not stay reachable from the JVM's hooks           //
+         ///////////////////////////////////////////////////////////////////////
+         WeakReference<AssistantRuntime> self = new WeakReference<>(this);
+         Integer graceSeconds = config.getShutdownGraceSeconds();
          shutdownHook = new Thread(() ->
          {
             try
             {
-               shutdown(Duration.ofSeconds(config.getShutdownGraceSeconds()));
+               AssistantRuntime runtime = self.get();
+               if(runtime != null)
+               {
+                  runtime.shutdown(Duration.ofSeconds(graceSeconds));
+               }
             }
             catch(Throwable ignored)
             {

qbit-assistant/src/main/resources/help/qbit-assistant.yaml

@@ -1,5 +1,5 @@
 bundle: qbit-assistant
-version: 0.1.0-SNAPSHOT
+version: ${project.version}
 layer: QBIT
 entries:
 - key: app:assistantAdmin;slot:help