Run systematic technical quality checks and generate a comprehensive report. Don't fix issues — document them for other commands to address.

Before scanning, read the existing design system (CSS / tokens / theme and a representative component) so "correct" is measured against the project's own conventions, not generic defaults. If the repo carries design context (PRODUCT.md, DESIGN.md, .impeccable.md, or a ## Design Context block in .github/copilot-instructions.md), read it too.

This is a code-level audit, not a design critique. Check what's measurable and verifiable in the implementation.

Diagnostic Scan

Run comprehensive checks across 5 dimensions. Score each dimension 0-4 using the criteria below.

1. Accessibility (A11y)

Check for: