feat(eng): add contributor reporting and management scripts

- Add eng/README.md documenting maintainer utilities
- Add eng/contributor-report.mjs for generating contributor reports
- Add eng/add-missing-contributors.mjs for automating contributor additions
- Add eng/utils/graceful-shutdown.mjs for script lifecycle management
- Update eng/update-readme.mjs with minor fixes
- Update package.json with new contributor scripts

Generated-by: GitHub Copilot <copilot@github.com>
Signed-off-by: Ashley Childress <6563688+anchildress1@users.noreply.github.com>

.github/workflows/contributors.yml

@@ -8,32 +8,52 @@ on:
 jobs:
   contributors:
     runs-on: ubuntu-latest
+    timeout-minutes: 12
     permissions:
       contents: write
       pull-requests: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
-          fetch-depth: 0
+          fetch-depth: 0  # Required: add-missing-contributors.js needs full git history
+
+      - name: Extract Node version from package.json
+        id: node-version
+        run: |
+          NODE_VERSION=$(jq -r '.engines.node // "22.x"' package.json)
+          echo "version=${NODE_VERSION}" >> "$GITHUB_OUTPUT"
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: ${{ steps.node-version.outputs.version }}
 
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
-      - name: Update contributors
-        run: npm run contributors:check
+      - name: Check and report contributors
+        run: |
+          CHECK_OUTPUT=$(npm run contributors:check 2>&1)
+          echo "$CHECK_OUTPUT"
+          
+          if echo "$CHECK_OUTPUT" | grep -q "Missing contributors"; then
+            echo "Missing contributors detected, generating report..."
+            mkdir -p reports
+            npm run contributors:report
+            
+            if [ -f reports/contributor-report.md ]; then
+              cat reports/contributor-report.md >> $GITHUB_STEP_SUMMARY
+            fi
+          else
+            echo "No missing contributors found"
+          fi
         env:
           PRIVATE_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        continue-on-error: true
 
       - name: Regenerate README
-        run: |
-          npm install
-          npm start
+        run: npm start
 
       - name: Check for changes
         id: verify-changed-files