Debug agentops attribute error in trace

[areibman]

📥 Pull Request

📘 Description Resolves an AttributeError that occurred when agentops.trace was incorrectly used as a context manager. This PR clarifies the distinction between agentops.trace (a decorator) and agentops.start_trace() (the function to use for context manager functionality).

Includes:

• A new AGENTOPS_TRACE_USAGE_GUIDE.md explaining the correct usage of AgentOps tracing methods.
• A fixed_example.py demonstrating all valid ways to use AgentOps tracing, including start_trace() as a context manager.

🧪 Testing The fixed_example.py was created and executed successfully, demonstrating that agentops.start_trace() correctly functions as a context manager and that other tracing methods (manual start/end, decorators) work as intended without errors.

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