Fix require path, add tests, CI and a Central-ready pom

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Java ${{ matrix.java }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java: ['8', '11', '17', '21']
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v6
+      - name: set up Java
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'zulu'
+          java-version: ${{ matrix.java }}
+          cache: 'maven'
+      - name: set up ant (rake-ant shells out to `ant -diagnostics`)
+        uses: cedx/SetupAnt@v7
+      - name: build and test
+        run: ./mvnw -ntp -B verify
+
+  # The Central-ready bundle: sources, javadoc and the jar. Signing needs the
+  # release key, so it is skipped here.
+  release-profile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-java@v5
+        with:
+          distribution: 'zulu'
+          java-version: '21'
+          cache: 'maven'
+      - name: package with release profile
+        run: ./mvnw -ntp -B -Prelease verify -DskipTests -Dgpg.skip
+      - uses: actions/upload-artifact@v4
+        with:
+          name: jruby-ant-jars
+          path: target/*.jar

.gitignore

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+target/
+.idea/
+*.iml
+.classpath
+.project
+.settings/
+.vscode/
+.DS_Store
+.mvn/wrapper/maven-wrapper.jar

.mvn/extensions.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extensions>
+  <!-- lets Maven resolve rubygems.org gems as rubygems:<name>:<version> artifacts -->
+  <extension>
+    <groupId>org.jruby.maven</groupId>
+    <artifactId>mavengem-wagon</artifactId>
+    <version>2.0.2</version>
+  </extension>
+</extensions>

.mvn/wrapper/maven-wrapper.properties

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+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip

README.md

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+# jruby-ant
+
+Ant tasks that run [Rake](https://github.com/ruby/rake) from an Ant build, the opposite
+direction of the [rake-ant](https://github.com/jruby/rake-ant) gem (which calls Ant from a
+Rakefile). These tasks used to live in JRuby itself as `org.jruby.ant`.
+
+```xml
+<taskdef name="rake" classname="org.jruby.ant.Rake"/>
+<taskdef name="rake-import" classname="org.jruby.ant.RakeImport"/>
+
+<rake file="Rakefile" task="default"/>
+<rake-import file="Rakefile"/>
+```
+
+## Maven
+
+```xml
+<dependency>
+  <groupId>org.jruby</groupId>
+  <artifactId>jruby-ant</artifactId>
+  <version>1.0.0</version>
+</dependency>
+```
+
+## Requirements
+
+`jruby-base`/`jruby-complete` and `ant` are `provided`: put them on Ant's classpath yourself,
+along with JRuby's standard library (for Rake).
+
+The Ruby half, the [rake-ant](https://github.com/jruby/rake-ant) gem, is bundled into the
+jar (its `lib` files sit at the jar root), so there is no separate gem to install. The version
+is `rake-ant.version` in `pom.xml`.
+
+rake-ant finds Ant's jars through `ANT_HOME` or by running `ant -diagnostics`, so Ant must be
+installed (`ANT_HOME` set or `ant` on `PATH`).
+
+## Building
+
+```
+./mvnw verify
+```
+
+The build downloads the rake-ant gem from rubygems.org through the
+[mavengem](https://github.com/jruby/mavengem-wagon) wagon (`.mvn/extensions.xml`), installs it
+with `gem-maven-plugin` and copies its `lib` into `target/classes`. Tests are unit tests against
+a stub `RakeWrapper` plus an Ant -> Rake integration test (skipped without Ant installed).
+
+## Releasing
+
+Releases use the Maven release plugin. The plugin runs `deploy` with the `release` profile
+(sources and javadoc jars, GPG signing, upload to the Central Portal), so GPG and the `central`
+server credentials must be set up in `settings.xml`:
+
+```
+./mvnw release:prepare
+./mvnw release:perform
+```