feat: add Maven Central packaging and release publishing

refactor: move Maven POM and publication logic into gradle/maven-pom.gradle
feat: publish signed mavenJava artifacts with sources and Javadoc jars
feat: add Central staging, checksum generation, and centralBundle packaging
feat: add packageReleaseCandidate task for clean local release verification
docs: define Maven POM metadata for org.egothor:radixor
docs: switch project licensing metadata and repository license file to BSD-3-Clause
ci: build signed Central bundle in tagged release workflow
ci: upload Central bundle to Maven Central via Sonatype Portal API
ci: attach Central bundle to GitHub release assets

gradle.properties

@@ -1 +1,19 @@
 org.gradle.dependency.verification=strict
+
+pomName=Radixor
+pomDescription=Fast algorithmic stemming with compact patch-command tries in the Egothor tradition.
+pomLicenseDistribution=repo
+
+mavenArtifactId=radixor
+
+pomDeveloperId=egothor
+pomDeveloperName=Leo Galambos
+pomDeveloperEmail=egothor@gmail.com
+
+pomUrl=https://github.com/leogalambos/Radixor
+pomScmUrl=https://github.com/leogalambos/Radixor
+pomScmConnection=scm:git:https://github.com/leogalambos/Radixor.git
+pomScmDeveloperConnection=scm:git:ssh://git@github.com/leogalambos/Radixor.git
+
+pomLicenseName=BSD-3-Clause
+pomLicenseUrl=https://spdx.org/licenses/BSD-3-Clause.html