feat(docs): port Docusaurus documentation site with full build validation

.github/workflows/copyright-headers.yml

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+name: Copyright Headers
+
+on:
+  pull_request:
+    paths:
+      - 'docs/docusaurus/src/**'
+      - '.github/workflows/copyright-headers.yml'
+  workflow_call:
+    inputs:
+      soft-fail:
+        description: 'Whether to continue on copyright header violations'
+        required: false
+        type: boolean
+        default: false
+
+permissions:
+  contents: read
+
+jobs:
+  copyright-headers:
+    name: Copyright Header Validation
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+
+      - name: Validate copyright headers
+        id: validate
+        shell: bash
+        run: |
+          MISSING=0
+          HEADER_PATTERN="Copyright (c) Microsoft Corporation"
+
+          echo "Checking copyright headers in docs/docusaurus/src/..."
+          while IFS= read -r -d '' file; do
+            if ! head -5 "$file" | grep -q "$HEADER_PATTERN"; then
+              echo "::warning file=${file}::Missing copyright header: ${file}"
+              MISSING=$((MISSING + 1))
+            fi
+          done < <(find docs/docusaurus/src -type f \( -name '*.ts' -o -name '*.tsx' -o -name '*.js' -o -name '*.jsx' -o -name '*.css' \) -print0)
+
+          echo "Files missing headers: $MISSING"
+          if [ "$MISSING" -gt 0 ]; then
+            echo "COPYRIGHT_FAILED=true" >> "$GITHUB_ENV"
+          fi
+        continue-on-error: ${{ inputs.soft-fail }}
+
+      - name: Check results
+        if: ${{ !inputs.soft-fail }}
+        shell: bash
+        run: |
+          if [ "$COPYRIGHT_FAILED" = "true" ]; then
+            echo "::error::Copyright header validation found violations"
+            exit 1
+          fi

.github/workflows/deploy-docs.yml

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+# Docusaurus documentation site deployment
+# Prerequisite: Enable GitHub Pages in repo Settings > Pages > Source: GitHub Actions
+# and allow the target branch in Settings > Environments > github-pages > Deployment branches
+
+name: Deploy Documentation Site
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'docs/**'
+      - '.github/workflows/deploy-docs.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: pages-deploy-${{ github.ref }}
+  cancel-in-progress: false
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Docusaurus Tests
+    uses: ./.github/workflows/docusaurus-tests.yml
+    permissions:
+      contents: read
+    with:
+      soft-fail: false
+
+  build:
+    name: Build Docusaurus
+    needs: test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: docs/docusaurus/package-lock.json
+
+      - name: Install dependencies
+        working-directory: docs/docusaurus
+        run: npm ci
+
+      - name: Build site
+        working-directory: docs/docusaurus
+        run: npm run build
+
+      - name: Configure Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/docusaurus/build
+
+  deploy:
+    name: Deploy to GitHub Pages
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/docusaurus-tests.yml

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+name: Docusaurus Tests
+
+on:
+  pull_request:
+    paths:
+      - 'docs/docusaurus/**'
+      - '.github/workflows/docusaurus-tests.yml'
+  workflow_call:
+    inputs:
+      soft-fail:
+        description: 'Whether to continue on test failures'
+        required: false
+        type: boolean
+        default: false
+
+permissions:
+  contents: read
+
+jobs:
+  docusaurus:
+    name: Docusaurus Unit Tests
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: npm
+          cache-dependency-path: docs/docusaurus/package-lock.json
+
+      - name: Install dependencies
+        working-directory: docs/docusaurus
+        run: npm ci
+
+      - name: Run tests
+        working-directory: docs/docusaurus
+        run: npm test
+        continue-on-error: ${{ inputs.soft-fail }}
+
+      - name: Build verification
+        working-directory: docs/docusaurus
+        run: npm run build
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: docusaurus-test-results
+          path: docs/docusaurus/test-results/
+          retention-days: 30
+          if-no-files-found: ignore

.github/workflows/gitleaks-scan.yml

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+name: Gitleaks Secret Scan
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_call:
+    inputs:
+      soft-fail:
+        description: 'Whether to continue on secret detection'
+        required: false
+        type: boolean
+        default: false
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    name: Gitleaks Secret Scan
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+
+      - name: Download and verify gitleaks
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          GITLEAKS_VERSION="8.30.0"
+          GITLEAKS_SHA256="79a3ab579b53f71efd634f3aaf7e04a0fa0cf206b7ed434638d1547a2470a66e"
+          GITLEAKS_URL="https://github.com/gitleaks/gitleaks/releases/download/v${GITLEAKS_VERSION}/gitleaks_${GITLEAKS_VERSION}_linux_x64.tar.gz"
+          GITLEAKS_TARBALL="gitleaks.tar.gz"
+
+          echo "Downloading gitleaks v${GITLEAKS_VERSION}..."
+          curl -fsSL -o "${GITLEAKS_TARBALL}" "${GITLEAKS_URL}"
+
+          echo "Verifying SHA256 checksum..."
+          echo "${GITLEAKS_SHA256}  ${GITLEAKS_TARBALL}" | sha256sum -c -
+
+          echo "Extracting gitleaks binary..."
+          tar -xzf "${GITLEAKS_TARBALL}" gitleaks
+          chmod +x gitleaks
+
+          echo "Gitleaks version:"
+          ./gitleaks version
+
+      - name: Run gitleaks scan
+        id: gitleaks
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          mkdir -p logs
+
+          SCAN_ARGS=(
+            "git"
+            "--report-format" "sarif"
+            "--report-path" "logs/gitleaks-results.sarif"
+            "--redact"
+            "--log-level" "info"
+          )
+
+          if [ -f ".gitleaksignore" ]; then
+            echo "Found .gitleaksignore — known secrets will be suppressed."
+          fi
+
+          echo "Running gitleaks scan..."
+          EXIT_CODE=0
+          ./gitleaks "${SCAN_ARGS[@]}" || EXIT_CODE=$?
+
+          if [ "$EXIT_CODE" -eq 0 ]; then
+            echo "No secrets detected."
+            echo "leaks-found=false" >> "$GITHUB_OUTPUT"
+          elif [ "$EXIT_CODE" -eq 1 ]; then
+            echo "::warning::Gitleaks detected secrets in the repository."
+            echo "leaks-found=true" >> "$GITHUB_OUTPUT"
+            if [ "${{ inputs.soft-fail }}" != "true" ]; then
+              echo "::error::Secret scanning failed. Review detected secrets in logs/gitleaks-results.sarif"
+              exit 1
+            fi
+          else
+            echo "::error::Gitleaks encountered an unexpected error (exit code: $EXIT_CODE)"
+            exit "$EXIT_CODE"
+          fi
+
+      - name: Upload SARIF to Security tab
+        if: always()
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: logs/gitleaks-results.sarif
+          category: gitleaks
+        continue-on-error: true
+
+      - name: Upload scan results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: gitleaks-results
+          path: logs/gitleaks-results.sarif
+          retention-days: 90
+
+      - name: Add job summary
+        if: always()
+        shell: bash
+        run: |
+          LEAKS_FOUND="${{ steps.gitleaks.outputs.leaks-found }}"
+          if [ "$LEAKS_FOUND" = "true" ]; then
+            STATUS="⚠️ Secrets Detected"
+          else
+            STATUS="✅ No Secrets Found"
+          fi
+
+          cat >> "$GITHUB_STEP_SUMMARY" <<EOF
+          ## Gitleaks Secret Scan Results
+
+          | Metric | Value |
+          |--------|-------|
+          | Status | $STATUS |
+
+          EOF