[google-labs-jules]

Why

The design simulator previously logged a hardcoded success message (APCA Contrast Verification: Perceptual Lightness Compliance Checked) during accessibility audits. Because this static message bypassed the actual calculation logic, it produced false-positive compliance reports that could easily mask illegible color choices.

To improve the integrity of our design system audits, this PR replaces the hardcoded string with a dynamic APCA contrast calculation. Designers and developers will now receive accurate, real-time feedback on color legibility.

Key Decisions & Rationale

• Leveraged Existing Utilities: Used the internal calculatePerceptualContrast helper rather than introducing external packages, keeping the codebase lightweight and maintainable.
• Strictly Scoped Audit: Focused solely on the primary color pair to fulfill the task requirements efficiently without introducing recursive element auditing.
• Reporting-Only Impact: Maintained the guardrail that this calculated contrast is strictly for logging/reporting within the "Cognitive Metrics Report" and does not influence the final Taste Score.
• Zero Space Parsing Changes: Kept the existing OKLCH color parsing logic intact, extracting lightness data dynamically from the context.

What Changed

• Removed Static Logger: Cleaned up the hardcoded "APCA Contrast Verification: Perceptual Lightness Compliance Checked." log inside skills/utils/design-simulator.js.
• Exposed Contextual Color Metrics: Updated runTasteAudits to return the colorMetrics containing minLightness and maxLightness derived from OKLCH rules.
• Integrated Dynamic Calculation: Fed these lightness parameters into the calculatePerceptualContrast helper.
• Updated Report Output: Modified the simulator output to display the dynamically computed result: - APCA Contrast Verification: Calculated Lc <value> (Primary Pair).