Remove Pages auto-enable step from deploy workflow

The Actions integration token cannot create the Pages site
("Resource not accessible by integration"), so enablement must be done
once in repo settings. Deploy works normally after that.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPEvmMbac2fCvKXpQcovj8

.github/workflows/deploy.yml

@@ -27,12 +27,6 @@ jobs:
         with:
           node-version: 22
 
-      # Enables GitHub Pages on first run so no manual Settings toggle is needed.
-      - name: Configure Pages
-        uses: actions/configure-pages@v5
-        with:
-          enablement: true
-
       - name: Install dependencies
         run: npm install --no-audit --no-fund