Lightweight skills (feat, hotfix, bugfix) had zero plugin awareness —
design tasks ran without ui-ux-pro-max even when relevant. Add a
design gate (lib/design-gate.md) that auto-detects UI/style signals
in task description and filesystem, then asks the user to activate
ui-ux-pro-max if inactive. Orchestrators already handle this via
their STEP 0 plugin-check.
Co-Authored-By: Claude <noreply@anthropic.com>