docs: add Rewind to ecosystem integrations list

Rewind is a time-travel debugger for AI agents — it records every LLM
call and tool execution via a TracingProcessor, then lets you fork
timelines, replay from failure (cached steps + live re-execution),
and diff the results.

Integration: `pip install rewind-agent[agents]` + `rewind_agent.init()`
auto-registers the tracing processor. Zero config needed.

Docs: https://github.com/agentoptics/rewind/blob/master/docs/openai-agents-sdk.md

Author: risjai

docs/tracing.md

@@ -221,3 +221,4 @@ The following community and vendor integrations support the OpenAI Agents SDK tr
 -   [Traccia](https://traccia.ai/docs/integrations/openai-agents)
 -   [PromptLayer](https://docs.promptlayer.com/languages/integrations#openai-agents-sdk)
 -   [HoneyHive](https://docs.honeyhive.ai/v2/integrations/openai-agents)
+-   [Rewind](https://github.com/agentoptics/rewind/blob/master/docs/openai-agents-sdk.md)