feat: Add GitHub Actions CI and release workflows

CI Workflow (.github/workflows/ci.yml):
- Tests on Node.js 18, 20, 22
- Runs typecheck, tests, and build on every push/PR

Release Workflow (.github/workflows/release.yml):
- Triggered on version tags (v*) or manual dispatch
- Builds TypeScript and web frontend
- Creates distributable tarball and zip
- Publishes GitHub release with binaries
- Optional npm publishing (requires NPM_TOKEN secret)

Closes nd-27yb

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Type check
+        run: npm run typecheck
+
+      - name: Run tests
+        run: npm test
+
+      - name: Build
+        run: npm run build
+
+      - name: Build web frontend
+        run: npm run build:web

.github/workflows/release.yml

@@ -0,0 +1,128 @@
+name: Build and Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to release (e.g., 0.1.0)'
+        required: false
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Build TypeScript
+        run: npm run build
+
+      - name: Build web frontend
+        run: npm run build:web
+
+      - name: Create distribution package
+        run: |
+          mkdir -p release
+          cp -r dist release/
+          cp -r node_modules release/
+          cp package.json release/
+          cp README.md release/
+          # Create wrapper script
+          cat > release/fabric << 'SCRIPT'
+          #!/usr/bin/env node
+          require('./dist/cli.js');
+          SCRIPT
+          chmod +x release/fabric
+
+      - name: Create archives
+        run: |
+          cd release
+          tar -czvf ../fabric-linux-x64.tar.gz .
+          zip -r ../fabric-linux-x64.zip .
+
+      - name: Get version
+        id: version
+        run: |
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ -n "${{ github.event.inputs.version }}" ]; then
+            echo "VERSION=${{ github.event.inputs.version }}" >> $GITHUB_OUTPUT
+          else
+            echo "VERSION=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ steps.version.outputs.VERSION }}
+          name: FABRIC v${{ steps.version.outputs.VERSION }}
+          body: |
+            ## FABRIC v${{ steps.version.outputs.VERSION }}
+
+            Flow Analysis & Bead Reporting Interface Console
+
+            ### Installation
+
+            ```bash
+            # Download and extract
+            curl -L https://github.com/jedarden/FABRIC/releases/download/v${{ steps.version.outputs.VERSION }}/fabric-linux-x64.tar.gz | tar xz
+
+            # Run
+            ./fabric tui   # Terminal UI
+            ./fabric web   # Web dashboard
+            ```
+
+            ### Requirements
+            - Node.js >= 18.0.0
+
+          files: |
+            fabric-linux-x64.tar.gz
+            fabric-linux-x64.zip
+          draft: false
+          prerelease: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  # Optional: Publish to npm
+  publish-npm:
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Publish to npm
+        run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}