Add production-readiness skill

[Meghshyams]

What is this?

production-readiness is a Claude Code plugin that runs a comprehensive production readiness audit with 40+ automated checks across 7 pillars:

• Security (secrets, dependencies, input validation, XSS, SQL injection)
• Visual QA (Playwright screenshots + vision-based inspection)
• Code Quality (lint, types, debug statements, tech debt)
• Testing (runs test suites, coverage, critical path analysis)
• Error Handling (error boundaries, tracking, health checks, logging)
• Config & Build (build verification, env docs, source maps, dev leaks)
• Performance (images, bundle size, caching, N+1 queries)

Auto-detects the project stack (Next.js, React, Django, Rails, Go, etc.) with no configuration needed. Supports smart git-aware caching for incremental reruns.