Add Agent Browser WebAuthn community skill

[kalepail]

Summary

Adds Kalepail's Agent Browser WebAuthn skill to the community skills directory.

The skill helps agents test passkey, WebAuthn, and Stellar smart-account browser flows by wrapping agent-browser commands with a Chrome DevTools virtual authenticator.

Validation

• Published skill repo: https://github.com/kalepail/skills
• Validated the skill with quick_validate.py
• Ran the helper help path with Node.js
• Ran pnpm lint:ts in site/

[Copilot]

Pull request overview

Adds a new community skill card to the Stellar Skills landing page, pointing to Kalepail’s external “Agent Browser WebAuthn” skill documentation.

Changes:

• Add a new ECOSYSTEM_CARDS entry for “Agent Browser WebAuthn”.
• Link to the external SKILL.md in kalepail/skills for copy-to-clipboard and source navigation.

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