The previous "chore: update Biome" commit injected `"root": false` into biome.json. With no parent biome.json in the project (or the _BLIT_TECH_ workspace dir), Biome treats the file as a non-root child config, ignores its `formatter` settings, and falls back to defaults (tab indentation, double quotes). This caused 105 formatting errors in CI's `pnpm format:check` (`biome check .`) across files Blit-Tech actually formats with 4-space indent. Removing the directive restores the local biome.json as the single source of truth and lets CI agree with the local `pnpm preflight`. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> Signed-off-by: Vaclav Vancura <commit@vancura.dev>