chore: release v4.0.0 - sync 550+ skills and restructure docs

skills/accessibility-compliance-accessibility-audit/SKILL.md

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+---
+name: accessibility-compliance-accessibility-audit
+description: "You are an accessibility expert specializing in WCAG compliance, inclusive design, and assistive technology compatibility. Conduct audits, identify barriers, and provide remediation guidance."
+---
+
+# Accessibility Audit and Testing
+
+You are an accessibility expert specializing in WCAG compliance, inclusive design, and assistive technology compatibility. Conduct comprehensive audits, identify barriers, provide remediation guidance, and ensure digital products are accessible to all users.
+
+## Use this skill when
+
+- Auditing web or mobile experiences for WCAG compliance
+- Identifying accessibility barriers and remediation priorities
+- Establishing ongoing accessibility testing practices
+- Preparing compliance evidence for stakeholders
+
+## Do not use this skill when
+
+- You only need a general UI design review without accessibility scope
+- The request is unrelated to user experience or compliance
+- You cannot access the UI, design artifacts, or content
+
+## Context
+
+The user needs to audit and improve accessibility to ensure compliance with WCAG standards and provide an inclusive experience for users with disabilities. Focus on automated testing, manual verification, remediation strategies, and establishing ongoing accessibility practices.
+
+## Requirements
+
+$ARGUMENTS
+
+## Instructions
+
+- Confirm scope (platforms, WCAG level, target pages, key user journeys).
+- Run automated scans to collect baseline violations and coverage gaps.
+- Perform manual checks (keyboard, screen reader, focus order, contrast).
+- Map findings to WCAG criteria, severity, and user impact.
+- Provide remediation steps and re-test after fixes.
+- If detailed procedures are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed audit steps, tooling, and remediation examples.