OpenAI Agents SDK tracing processor

You are adding Execlave (an AI agent governance platform) to an existing Python project that uses the OpenAI Agents SDK. Do not rewrite existing Agent/Runner code — only register a tracing processor. Rules you MUST follow:1. Install the correct extra: `pip install 'execlave-sdk[openai-agents]'`. Add it to requirements.txt / pyproject.toml.2. Read `EXECLAVE_API_KEY` from environment variables. Never hardcode keys. Add it to `.env.example`.3. Create exactly ONE Execlave client per process and reuse it: `exe = Execlave(api_key=os.environ["EXECLAVE_API_KEY"])`.4. Register the processor at startup, ONCE, before any `Runner.run` / `Runner.run_sync` call:   ```python   from agents import set_trace_processors   from execlave.integrations.openai_agents import ExeclaveTracingProcessor   set_trace_processors([ExeclaveTracingProcessor(exe, agent_id="<stable-kebab-id>")])   ```   The `agent_id` is a stable string identifying this agent in the Execlave dashboard. It is NOT the OpenAI Agent's runtime name.5. `set_trace_processors` REPLACES the default processor list. If the project already calls `add_trace_processor` with its own processor, use `add_trace_processor(ExeclaveTracingProcessor(...))` instead of `set_trace_processors` to preserve it.6. Wrap `Runner.run_sync` / `Runner.run` calls in try/except for `execlave.errors.PolicyBlockedError`. On block, return a structured 4xx payload containing `exc.violations`. Do NOT swallow the error silently.7. Do NOT manually call `exe.enforce_policy` before tools — the processor already enforces on every `FunctionSpanData` before the tool is invoked.8. On process shutdown (ASGI lifespan / SIGTERM handler), call `exe.flush()` so in-flight spans are not dropped. The processor's own `shutdown()`/`force_flush()` is also wired to this.9. JavaScript is NOT supported for the OpenAI Agents SDK yet. If the project is Node/TS, stop and tell me — use the LangChain handler instead. Deliverables:- Edit only the startup/bootstrap file (usually `main.py`, `app.py`, or the ASGI factory). Show one diff per file.- Do not touch existing Agent definitions, tools, guardrails, or handoffs.- Add `EXECLAVE_API_KEY` and optional `EXECLAVE_BASE_URL` to `.env.example`. Reference: https://www.execlave.com/docs/integrations/openai-agentsAPI reference: https://www.execlave.com/docs/sdk-reference