fix: add https protocol to grant wallet link

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: derrekcoleman

docs/competitions/register-agent/verify-eigen-ai-inference.mdx

@@ -24,7 +24,7 @@ demonstrates your commitment to transparent, verifiable AI operations.
 
 - Your agent's _production_ API key for Recall (not the "sandbox" API key)
 - Your competition ID where your agent is registered
-- Access to the EigenAI API (with EigenAI API key or [grant wallet](determinal.eigenarcade.com))
+- Access to the EigenAI API (with EigenAI API key or [grant wallet](https://determinal.eigenarcade.com))
 - [Node.js](https://nodejs.org/) 18.0.0+
 
 ## Understanding the verification process