feat: sync agent-browser skill with upstream vercel-labs/agent-browser
Update SKILL.md to match the latest upstream skill from
vercel-labs/agent-browser, adding substantial new capabilities:
- Authentication (auth vault, profiles, session persistence, state files)
- Command chaining, annotated screenshots, diffing
- Security features (content boundaries, domain allowlist, action policy)
- iOS Simulator support, Lightpanda engine, downloads, clipboard
- JS eval improvements (--stdin, -b for shell safety)
- Timeout guidance, config files, session cleanup
Add 7 reference docs (commands, authentication, snapshot-refs,
session-management, video-recording, profiling, proxy-support) and
3 ready-to-use shell templates.
Kept our YAML frontmatter, setup check section, and Playwright MCP
comparison table which are unique to our plugin context.
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