fix: move GPG signing to release profile only — SNAPSHOTs don't need signing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: aksOps

pom.xml

@@ -349,27 +349,6 @@
                 </executions>
             </plugin>
 
-            <!-- GPG signing (required by Maven Central, no passphrase) -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-gpg-plugin</artifactId>
-                <version>3.2.7</version>
-                <executions>
-                    <execution>
-                        <id>sign-artifacts</id>
-                        <phase>verify</phase>
-                        <goals>
-                            <goal>sign</goal>
-                        </goals>
-                        <configuration>
-                            <gpgArguments>
-                                <arg>--pinentry-mode</arg>
-                                <arg>loopback</arg>
-                            </gpgArguments>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
         </plugins>
     </build>