• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

When OpenCode receives an HTTP request with traceparent / tracestate, it should extract that context and carry it through request handling.

Today those headers stop at the server boundary, so request traces start disconnected instead of attaching to the upstream trace.

This is a small core piece of the broader tracing work:

• Add OTEL export capabilities for observability and monitoring #12142 covers broader OTEL export / observability support
• Feature Request: Add Langfuse Tracing #219 covers Langfuse-related usage