feat: add Maven package publishing to GitHub Packages

- Add pom.xml with proper Maven project configuration
  - All JUNG/commons dependencies from Maven Central
  - Local JAR install profile for vendored deps (dump, j3d-core)
  - maven-shade-plugin for fat JAR with all dependencies
  - Source and Javadoc JAR generation
  - GitHub Packages distribution management
- Add publish.yml workflow triggered on release or manual dispatch
  - Installs local vendored JARs, builds, publishes to GitHub Packages
  - Attaches fat JAR and slim JAR to GitHub releases
  - Supports version override via workflow_dispatch input
- Add settings.xml for GitHub Packages authentication
- Update README with Maven dependency and fat JAR usage instructions

Author: sauravbhattacharya001

.github/workflows/publish.yml

@@ -0,0 +1,80 @@
+name: Publish to GitHub Packages
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to publish (e.g., 1.1.0)'
+        required: false
+        type: string
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+          server-id: github
+          settings-path: ${{ github.workspace }}
+
+      - name: Install local vendored JARs
+        run: |
+          mvn initialize -P install-local-deps -B
+
+      - name: Set version from release tag
+        if: github.event_name == 'release'
+        run: |
+          VERSION="${{ github.event.release.tag_name }}"
+          VERSION="${VERSION#v}"
+          mvn versions:set -DnewVersion="$VERSION" -B
+
+      - name: Set version from input
+        if: github.event_name == 'workflow_dispatch' && github.event.inputs.version != ''
+        run: |
+          mvn versions:set -DnewVersion="${{ github.event.inputs.version }}" -B
+
+      - name: Build package
+        run: mvn package -B -DskipTests
+
+      - name: Publish to GitHub Packages
+        run: mvn deploy -B -DskipTests -s ${{ github.workspace }}/settings.xml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload JAR artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: graphvisual-jars
+          path: |
+            target/*.jar
+            !target/original-*.jar
+          retention-days: 90
+
+      - name: Attach JAR to release
+        if: github.event_name == 'release'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          # Upload the shaded (fat) JAR to the release
+          FAT_JAR=$(ls target/*-all.jar 2>/dev/null | head -1)
+          if [ -n "$FAT_JAR" ]; then
+            gh release upload "${{ github.event.release.tag_name }}" "$FAT_JAR" --clobber
+          fi
+          # Upload the slim JAR too
+          SLIM_JAR=$(ls target/graphvisual-*.jar 2>/dev/null | grep -v all | grep -v sources | grep -v javadoc | grep -v original | head -1)
+          if [ -n "$SLIM_JAR" ]; then
+            gh release upload "${{ github.event.release.tag_name }}" "$SLIM_JAR" --clobber
+          fi

README.md

@@ -205,6 +205,59 @@ java -cp "build/classes:build/test/classes:$(find lib -name '*.jar' | tr '\n' ':
   org.junit.runner.JUnitCore app.UtilMethodsTest gvisual.EdgeTest
 ```
 
+## Maven / GitHub Packages
+
+GraphVisual is published to [GitHub Packages](https://github.com/sauravbhattacharya001/GraphVisual/packages) as a Maven artifact. You can use it as a library dependency or download the fat JAR directly.
+
+### Add as a Maven dependency
+
+1. Configure GitHub Packages in your `~/.m2/settings.xml`:
+
+```xml
+<servers>
+  <server>
+    <id>github</id>
+    <username>YOUR_GITHUB_USERNAME</username>
+    <password>YOUR_GITHUB_TOKEN</password>
+  </server>
+</servers>
+```
+
+2. Add the repository and dependency to your `pom.xml`:
+
+```xml
+<repositories>
+  <repository>
+    <id>github</id>
+    <url>https://maven.pkg.github.com/sauravbhattacharya001/GraphVisual</url>
+  </repository>
+</repositories>
+
+<dependency>
+  <groupId>com.github.sauravbhattacharya001</groupId>
+  <artifactId>graphvisual</artifactId>
+  <version>1.1.0</version>
+</dependency>
+```
+
+### Download the fat JAR
+
+Each [release](https://github.com/sauravbhattacharya001/GraphVisual/releases) includes a standalone `graphvisual-*-all.jar` with all dependencies bundled:
+
+```bash
+java -jar graphvisual-1.1.0-all.jar
+```
+
+### Build with Maven locally
+
+```bash
+# Install vendored local JARs first
+mvn initialize -P install-local-deps
+
+# Build the project
+mvn package -B
+```
+
 ## Docker
 
 ### Build