Include source JAR (MM.src.jar) in BEAST package ZIP

Move maven-source-plugin from release profile to default build so the
sources JAR is produced during mvn package. Add it to the assembly
descriptor at the ZIP root, matching the BEAST 2.7 convention.

Author: alexeid

pom.xml

@@ -168,6 +168,19 @@
                 </configuration>
             </plugin>
 
+            <!-- Source JAR (included in BEAST package ZIP as MM.src.jar) -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-source-plugin</artifactId>
+                <version>3.3.1</version>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <goals><goal>jar-no-fork</goal></goals>
+                    </execution>
+                </executions>
+            </plugin>
+
             <!-- Assemble BEAST package ZIP -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -196,17 +209,6 @@
             <id>release</id>
             <build>
                 <plugins>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-source-plugin</artifactId>
-                        <version>3.3.1</version>
-                        <executions>
-                            <execution>
-                                <id>attach-sources</id>
-                                <goals><goal>jar-no-fork</goal></goals>
-                            </execution>
-                        </executions>
-                    </plugin>
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-javadoc-plugin</artifactId>

src/assembly/beast-package.xml

@@ -13,6 +13,12 @@
             <source>${project.basedir}/version.xml</source>
             <outputDirectory>/</outputDirectory>
         </file>
+        <!-- Source JAR at top level (BEAST convention: PKG_NAME.src.jar) -->
+        <file>
+            <source>${project.build.directory}/${project.build.finalName}-sources.jar</source>
+            <destName>${beast.pkg.name}.src.jar</destName>
+            <outputDirectory>/</outputDirectory>
+        </file>
     </files>
 
     <!-- Module JAR only (BEAST core, JavaFX, and their transitive deps are provided by the runtime) -->