feat: add comprehensive CI/CD pipeline

Adds GitHub Actions workflows for CI, maintenance, and releases with multi-platform testing matrix.

.github/workflows/reusable-release.yml

@@ -0,0 +1,59 @@
+name: Reusable Release Workflow
+
+on:
+  workflow_call:
+    inputs:
+      tag:
+        description: 'Version tag (e.g., v1.0.0)'
+        required: true
+        type: string
+      generate-notes:
+        description: 'Auto-generate release notes'
+        required: false
+        type: boolean
+        default: true
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: Create Release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Validate version tag
+        run: |
+          if ! [[ "${{ inputs.tag }}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo "Invalid version tag format. Expected vX.Y.Z"
+            exit 1
+          fi
+
+      - name: Generate changelog
+        id: changelog
+        run: |
+          PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
+          if [ -z "$PREV_TAG" ]; then
+            COMMITS=$(git log --pretty=format:"- %s" HEAD)
+          else
+            COMMITS=$(git log --pretty=format:"- %s" ${PREV_TAG}..HEAD)
+          fi
+          # Use unique delimiter to prevent truncation if commit messages contain EOF
+          DELIMITER="COMMITS_END_$(date +%s)"
+          echo "commits<<${DELIMITER}" >> $GITHUB_OUTPUT
+          echo "$COMMITS" >> $GITHUB_OUTPUT
+          echo "${DELIMITER}" >> $GITHUB_OUTPUT
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ inputs.tag }}
+          body: |
+            ## Changes
+            ${{ steps.changelog.outputs.commits }}
+          generate_release_notes: ${{ inputs.generate-notes }}