Make tracer.trace_context async

[Yuge Zhang (ultmaster)]

No description provided.

[Copilot]

Pull Request Overview

This PR changes the tracer.trace_context method from a synchronous context manager to an asynchronous one to better support async tracing workflows.

Key changes:

• Converted trace_context method from @contextmanager to @asynccontextmanager across all tracer implementations
• Added _trace_context_sync internal method for backward compatibility in synchronous contexts
• Updated type annotations from Iterator to AsyncGenerator to match the async pattern

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
agentlightning/tracer/base.py	Updated base class to make trace_context async and added _trace_context_sync for compatibility
agentlightning/tracer/otel.py	Converted trace_context to async context manager
agentlightning/tracer/http.py	Added async trace_context wrapper around existing sync implementation
agentlightning/tracer/agentops.py	Converted trace_context to async and added sync wrapper
agentlightning/runner/legacy.py	Updated calls to use appropriate sync/async context manager
agentlightning/runner/agent.py	Updated to use async trace_context
tests/tracer/test_otel.py	Added async wrapper function and updated test calls to use async context
tests/tracer/test_integration.py	Updated to use sync context manager and changed port configuration
tests/runner/test_runner_context.py	Updated mock tracer to use async context manager
tests/runner/test_agent_runner.py	Updated mock tracer to use async context manager

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[Copilot]

The asyncio.run() call creates a new event loop for each subprocess call. Consider reusing an existing event loop or using asyncio.new_event_loop() with proper cleanup to avoid potential conflicts with existing event loops.

Suggested change

	asyncio.run(_otel_reward_subprocess_async(mode, conn))
	loop = asyncio.new_event_loop()
	try:
	asyncio.set_event_loop(loop)
	loop.run_until_complete(_otel_reward_subprocess_async(mode, conn))
	finally:
	loop.close()

[Copilot]

The synchronous function compute_reward() is being called within an async context manager. Consider making this function async or using await if it performs any I/O operations to maintain consistency with the async pattern.