Support for multi-thread in Opik

[pmenendz]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces multi-thread support for Opik tracing by decoupling tracer instantiation from setup and creating per-thread tracer instances.

• Store the Opik configuration in the agent and defer tracer creation.
• Add _create_opik_tracer to instantiate a tracer for each thread.
• Update get_response to attach a thread-specific tracer callback.

Comments suppressed due to low confidence (3)

src/expert/agent.py:104

• Add unit tests for _create_opik_tracer to verify it returns None when opik_config is unset and correctly instantiates an OpikTracer with the expected tags.

    def _create_opik_tracer(self, user_thread_id: str) -> OpikTracer | None:

src/expert/agent.py:115

• Verify that OpikTracer accepts a tags parameter in this form; if it expects metadata key/value pairs, you may need to pass a dict like tags={"thread_id": user_thread_id}.

            tags=[user_thread_id]

src/expert/agent.py:130

• [nitpick] Consider caching tracer instances per thread_id to avoid recreating them on each request, which could reduce overhead.

        tracer = self._create_opik_tracer(thread_id)