fix: integrate playwright-pro across all platforms (#258)

- Add root SKILL.md for OpenClaw and ClawHub compatibility
- Add to README: Skills Overview table, install section, badge count
- Regenerate .codex/skills-index.json with playwright-pro entry
- Add .codex/skills/playwright-pro symlink for Codex CLI
- Fix YAML frontmatter (single-line description for index parsing)

Platforms verified:
- Claude Code: marketplace.json ✅ (merged in PR #256)
- Codex CLI: symlink + skills-index.json ✅
- OpenClaw: SKILL.md auto-discovered by install script ✅
- ClawHub: published as playwright-pro@1.1.0 ✅

Co-authored-by: Leo <leo@openclaw.ai>

.codex/skills-index.json

@@ -3,7 +3,7 @@
   "name": "claude-code-skills",
   "description": "Production-ready skill packages for AI agents - Marketing, Engineering, Product, C-Level, PM, and RA/QM",
   "repository": "https://github.com/alirezarezvani/claude-skills",
-  "total_skills": 61,
+  "total_skills": 62,
   "skills": [
     {
       "name": "contract-and-proposal-writer",
@@ -71,6 +71,12 @@
       "category": "engineering",
       "description": "Microsoft 365 tenant administration for Global Administrators. Automate M365 tenant setup, Office 365 admin tasks, Azure AD user management, Exchange Online configuration, Teams administration, and security policies. Generate PowerShell scripts for bulk operations, Conditional Access policies, license management, and compliance reporting. Use for M365 tenant manager, Office 365 admin, Azure AD users, Global Administrator, tenant configuration, or Microsoft 365 automation."
     },
+    {
+      "name": "playwright-pro",
+      "source": "../../engineering-team/playwright-pro",
+      "category": "engineering",
+      "description": "Production-grade Playwright testing toolkit. Generate tests, fix flaky failures, migrate from Cypress/Selenium, sync with TestRail, run on BrowserStack. 55 templates, 3 agents, smart reporting."
+    },
     {
       "name": "senior-architect",
       "source": "../../engineering-team/senior-architect",
@@ -384,7 +390,7 @@
       "description": "Executive leadership and advisory skills"
     },
     "engineering": {
-      "count": 21,
+      "count": 22,
       "source": "../../engineering-team",
       "description": "Software engineering and technical skills"
     },

.codex/skills/playwright-pro

@@ -0,0 +1 @@
+../../engineering-team/playwright-pro