docs: add Rewind to ecosystem tracing processors list

[risjai]

Adds Rewind to the external tracing processors list.

Rewind provides RewindTracingProcessor, a subclass of agents.tracing.TracingProcessor that captures agent spans into a local time-travel debugger.

TracingProcessor implementation:

from agents.tracing import TracingProcessor

class RewindTracingProcessor(TracingProcessor):
    """Subclasses TracingProcessor to capture all agent spans."""

    def on_trace_start(self, trace): ...
    def on_trace_end(self, trace): ...
    def on_span_start(self, span): ...
    def on_span_end(self, span): ...  # maps GenerationSpanData, FunctionSpanData, HandoffSpanData → Rewind steps
    def shutdown(self): ...
    def force_flush(self): ...

Registration via add_trace_processor():

from agents.tracing import add_trace_processor
from rewind_agent.openai_agents import RewindTracingProcessor
from rewind_agent.store import Store

store = Store()
session_id, timeline_id = store.create_session("my-agent")
processor = RewindTracingProcessor(store, session_id, timeline_id)
add_trace_processor(processor)

• Source: https://github.com/agentoptics/rewind/blob/master/python/rewind_agent/openai_agents.py
• Docs: https://github.com/agentoptics/rewind/blob/master/docs/openai-agents-sdk.md
• PyPI: pip install rewind-agent[agents]

[seratch]

Thanks for sharing this! It seems you just started this open-source project. We'd like to see people starting to use it for OpenAI Agents SDK based apps. Let us keep this PR open for a while.