Addresses four issues from PR review thread #3835994755.

Changes

• deploy-s3.yml – Added artifact verification step after npm run build to fail fast if dist/ or dist/index.html is absent, preventing a silent bad deployment:

  - name: Verify build artifacts
    run: |
      [ -d "dist" ] || { echo "❌ dist/ missing"; exit 1; }
      [ -f "dist/index.html" ] || { echo "❌ dist/index.html missing"; exit 1; }
      echo "✅ Build artifacts verified"

• political-science-analysis/SKILL.md – Added inline comment on the QUALIFY clause noting it is only available in Snowflake, BigQuery, and DuckDB, with a hint to use a CTE + WHERE row_num = 1 for standard SQL portability.

• seo-best-practices/SKILL.md – Fixed Swedish compound noun: Risk analys → Riskanalys.

• mcp-gateway-security/SKILL.md – Disambiguated environment variable reference syntax across contexts: ${VAR_NAME} (MCP JSON), $VAR_NAME (shell), ${{ secrets.VAR_NAME }} (GitHub Actions).

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