[atherdon]

Summary

• Format the files Prettier rejects on main (.github/workflows/codeql.yml, .github/workflows/eslint.yml, and deepseek/*), which was failing the Node 24 CI job at npm run format:check.
• Stop the ESLint SARIF workflow from installing eslint@8.10.0 and pointing at a missing .eslintrc.js. It now uses Node 24, npm ci, the repo flat config, and only adds @microsoft/eslint-formatter-sarif.

Test plan

• CI format:check passes
• ESLint workflow install step no longer hits ERESOLVE

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