Add "Optimize Website Performance" check

[continue]

Adds the Optimize Website Performance check to this repository.

This check will be synced from .continue/checks/optimize-website-performance.md and can be customized by editing the file directly.

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Opened via Continue Hub

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Summary by cubic

Adds an automated Optimize Website Performance check that compares Netlify preview vs production deploys and flags bundle size regressions and config issues. Helps catch costly performance changes before merge with clear, actionable fixes.

• New Features
  • Adds .continue/checks/optimize-website-performance.md to audit Netlify deploys.
  • Uses netlify/netlify-mcp to fetch deploy URLs and measure JS/CSS/image sizes.
  • Triage rules: <10% auto-approve, 10–50% review, >50% block with root cause.
  • Blocks on disabled minification/tree-shaking, prod sourcemaps, or missing cache headers.
  • Outputs concise reports with prod/preview links and suggested fixes.

^{Written for commit 9e6b109. Summary will update on new commits. Review in cubic}

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