docs: remove cloudflare codemode package reference

Author: NathanFlurry

docs/use-cases/code-mode.mdx

@@ -85,5 +85,4 @@ See the [full working example](https://github.com/rivet-dev/secure-exec/tree/mai
 
 - [Complete Code Mode implementation guide](https://mcp-toolkit.nuxt.dev/advanced/code-mode) — end-to-end Code Mode walkthrough using MCP Toolkit
 - [Cloudflare Code Mode blog post](https://blog.cloudflare.com/code-mode/)
-- [`@cloudflare/codemode` package](https://github.com/cloudflare/agents/tree/main/packages/codemode)
 - [AI Agent Code Exec](/use-cases/ai-agent-code-exec) for simpler single-tool execution patterns