Add CI/CD and build scripts

GitHub Actions: CI on Java 11/17/21, publish to Maven Central on tag.
Bump-version script updates build.gradle and creates git tags.

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: Allow2 Dev

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: ['11', '17', '21']
+
+    name: Java ${{ matrix.java }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: ${{ matrix.java }}
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Run tests
+        run: ./gradlew test
+
+      - name: Build
+        run: ./gradlew build

.github/workflows/publish.yml

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+name: Publish
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Run tests
+        run: ./gradlew test
+
+      - name: Publish to Maven Central
+        run: ./gradlew publish
+        env:
+          OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
+          GPG_SIGNING_KEY: ${{ secrets.GPG_SIGNING_KEY }}
+          GPG_SIGNING_PASSWORD: ${{ secrets.GPG_SIGNING_PASSWORD }}
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          body: |
+            ## Installation
+
+            ### Gradle
+            ```groovy
+            implementation 'com.allow2:allow2-service:${{ github.ref_name }}'
+            ```
+
+            ### Maven
+            ```xml
+            <dependency>
+                <groupId>com.allow2</groupId>
+                <artifactId>allow2-service</artifactId>
+                <version>${{ github.ref_name }}</version>
+            </dependency>
+            ```
+
+            See [Maven Central](https://central.sonatype.com/artifact/com.allow2/allow2-service) for details.

scripts/bump-version.sh

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+#!/usr/bin/env bash
+# bump-version.sh -- Standardised version bumping for Allow2 Java Service SDK
+# Usage: ./scripts/bump-version.sh [prerelease|patch|minor|major] [--preid alpha|beta|rc]
+#
+# Java/Gradle: version is in build.gradle AND git tags.
+#
+# Examples:
+#   ./scripts/bump-version.sh prerelease --preid alpha   # v2.0.0-alpha.1 -> v2.0.0-alpha.2
+#   ./scripts/bump-version.sh patch                       # v2.0.0 -> v2.0.1
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+BUMP="${1:-prerelease}"
+PREID=""
+if [[ "${2:-}" == "--preid" ]]; then PREID="${3:-alpha}"; fi
+
+# Get latest version tag
+OLD=$(git tag -l 'v*' --sort=-v:refname | head -1 | sed 's/^v//')
+if [[ -z "$OLD" ]]; then
+  echo "No version tags found. Create one first: git tag v2.0.0-alpha.1" >&2
+  exit 1
+fi
+
+# Parse: 2.0.0 or 2.0.0-alpha.1
+if [[ "$OLD" =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)(-([a-z]+)\.([0-9]+))?$ ]]; then
+  MAJOR="${BASH_REMATCH[1]}"
+  MINOR="${BASH_REMATCH[2]}"
+  PATCH="${BASH_REMATCH[3]}"
+  PRE_TYPE="${BASH_REMATCH[5]:-}"
+  PRE_NUM="${BASH_REMATCH[6]:-}"
+else
+  echo "Cannot parse version: $OLD" >&2; exit 1
+fi
+
+case "$BUMP" in
+  prerelease)
+    PRE="${PREID:-${PRE_TYPE:-alpha}}"
+    if [[ "$PRE_TYPE" == "$PRE" && -n "$PRE_NUM" ]]; then
+      NEW="${MAJOR}.${MINOR}.${PATCH}-${PRE}.$((PRE_NUM + 1))"
+    else
+      NEW="${MAJOR}.${MINOR}.${PATCH}-${PRE}.1"
+    fi
+    ;;
+  patch) NEW="$MAJOR.$MINOR.$((PATCH + 1))" ;;
+  minor) NEW="$MAJOR.$((MINOR + 1)).0" ;;
+  major) NEW="$((MAJOR + 1)).0.0" ;;
+  *) echo "Usage: $0 [prerelease|patch|minor|major] [--preid alpha|beta|rc]" >&2; exit 1 ;;
+esac
+
+# Update build.gradle version
+sed -i "s/^version = '.*'/version = '$NEW'/" build.gradle
+
+echo "$OLD -> $NEW"
+git tag "v$NEW"
+echo "Tagged v$NEW -- push with: git push origin master --tags"