feat(engineering): add review-fix-a11y skill (WCAG 2.2 a11y audit + fix) (#375)
Adds review-fix-a11y (WCAG 2.2 a11y audit + fix) and free-llm-api skills.
Includes:
- review-fix-a11y: WCAG 2.2 audit workflow, a11y_audit.py scanner, contrast_checker.py
- free-llm-api: ChatAnywhere, Groq, Cerebras, OpenRouter, llm-mux, One API setup
- secret_scanner.py upgrade with secrets-patterns-db integration (1,600+ patterns)
Co-authored-by: ivanopenclaw223-alt <ivanopenclaw223-alt@users.noreply.github.com>
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