fix: ensure extension zip included in complete package

Moved plugin assembly execution to prepare-package phase to ensure
the extension zip artifact is created before the package phase.

Added maven-resources-plugin execution (copy-plugin-zip) to the
package phase to copy the generated extension zip into a reliable
'target/staging' directory.

Updated complete-package.xml assembly descriptor to use a fileSet
referencing 'target/staging' instead of relying on dependencySets
or potentially unstable property expansion for artifact inclusion.

This resolves the issue where the complete package artifact was
missing the Ghidra extension zip.

pom.xml

@@ -205,7 +205,7 @@
           <!-- Default execution for the plugin only -->
           <execution>
             <id>plugin-assembly</id>
-            <phase>package</phase>
+            <phase>prepare-package</phase> <!-- Run earlier to ensure zip exists for copy -->
             <goals>
               <goal>single</goal>
             </goals>
@@ -215,6 +215,9 @@
               </descriptors>
               <finalName>GhydraMCP-${git.commit.id.abbrev}-${maven.build.timestamp}</finalName>
               <appendAssemblyId>false</appendAssemblyId>
+              <!-- Don't attach artifact, we will copy it manually -->
+              <!-- <attach>true</attach> -->
+              <!-- <classifier>ghidra-extension</classifier> -->
             </configuration>
           </execution>
           
@@ -235,6 +238,33 @@
           </execution>
         </executions>
       </plugin>
+
+      <!-- Copy the generated plugin zip to a staging area -->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-resources-plugin</artifactId>
+        <version>3.3.1</version>
+        <executions>
+          <execution>
+            <id>copy-plugin-zip</id>
+            <phase>package</phase> <!-- Run after plugin-assembly -->
+            <goals>
+              <goal>copy-resources</goal>
+            </goals>
+            <configuration>
+              <outputDirectory>${project.build.directory}/staging</outputDirectory>
+              <resources>          
+                <resource>
+                  <directory>${project.build.directory}</directory>
+                  <includes>
+                    <include>GhydraMCP-${git.commit.id.abbrev}-${maven.build.timestamp}.zip</include>
+                  </includes>
+                </resource>
+              </resources>              
+            </configuration>            
+          </execution>
+        </executions>
+      </plugin>
       
       <!-- Copy dependencies and validate system paths -->
       <plugin>

src/assembly/complete-package.xml

@@ -22,12 +22,11 @@
             <outputDirectory></outputDirectory>
         </fileSet>
         
-        <!-- Include pre-built Ghidra plugin zip -->
-        <fileSet>
-            <directory>${project.build.directory}</directory>
+        <!-- Include the Ghidra plugin zip copied by maven-resources-plugin -->
+         <fileSet>
+            <directory>${project.build.directory}/staging</directory>
             <includes>
-                <!-- Use properties consistent with pom.xml finalName -->
-                <include>GhydraMCP-${git.commit.id.abbrev}-${maven.build.timestamp}.zip</include>
+                <include>GhydraMCP-*.zip</include>
             </includes>
             <outputDirectory></outputDirectory>
         </fileSet>