trace propagation in cloudflare workers not working as expected

[https://github.com/getsentry/sentry-mcp/blob/main/packages/mcp-cloudflare/src/server/routes/search.ts](https://github.com/getsentry/sentry-mcp/blob/main/packages/mcp-cloudflare/src/server/routes/search.ts) whatever is calling seems to be not getting traced.

frontend -> worker (mcp) -> worker (search route)

We should have traces between the workers.