Audit, reach, and maintain web usability and accessibility conformity against WCAG 2.2 Level AA (ISO/IEC 40500:2025), with EN 301 549, BITV 2.0, and BFSG mapping. Runs mandatory technical DOM/HTML tests and visual Playwright checks, plus understandability review. Use when the user asks for accessibility, WCAG, BITV, BFSG, EN 301 549, ISO 40500, usability conformity, keyboard/contrast audits, or Playwright a11y regression tests.