fix: wrap generate-wiki.yml if-expression in ${{ }} syntax

GitHub Actions parses bare [bot] as expression syntax. Wrapping
in ${{ }} resolves the workflow file error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: HanSur94

.github/workflows/generate-wiki.yml

@@ -16,7 +16,7 @@ jobs:
   generate:
     name: Generate Wiki Pages with LLM
     runs-on: ubuntu-latest
-    if: github.actor != 'github-actions[bot]'
+    if: ${{ github.actor != 'github-actions[bot]' }}
     steps:
       - name: Checkout main repo
         uses: actions/checkout@v4