[skills] Sync build-agents with current docs

<!-- vercel-plugin-drift-agent -->

Author: vercel-gh-bot-4[bot]

skills/build-agents/SKILL.md

@@ -9,7 +9,7 @@ metadata:
     - "https://github.com/vercel/eve"
     - "https://github.com/vercel-labs/slack-agent-skill"
     - "https://docs.slack.dev/ai/getting-started-with-vercel-skill/"
-    - "https://vercel.com/docs/vercel-connect"
+    - "https://vercel.com/docs/connect"
   bashPatterns:
     - '\bnpx\s+eve(?:@latest)?\s+init\b'
     - '\bbunx\s+eve(?:@latest)?\s+init\b'