Add Python SDK public API and examples

Co-authored-by: Codex <noreply@openai.com>

sdk/python/examples/02_turn_run/async.py

@@ -0,0 +1,37 @@
+import sys
+from pathlib import Path
+
+_EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
+if str(_EXAMPLES_ROOT) not in sys.path:
+    sys.path.insert(0, str(_EXAMPLES_ROOT))
+
+from _bootstrap import ensure_local_sdk_src, runtime_config
+
+ensure_local_sdk_src()
+
+import asyncio
+
+from codex_app_server import AsyncCodex, TextInput
+
+
+async def main() -> None:
+    async with AsyncCodex(config=runtime_config()) as codex:
+        thread = await codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
+        turn = await thread.turn(TextInput("Give 3 bullets about SIMD."))
+        result = await turn.run()
+
+        print("thread_id:", result.thread_id)
+        print("turn_id:", result.turn_id)
+        print("status:", result.status)
+        if result.error is not None:
+            print("error:", result.error)
+        print("text:", result.text)
+        print("items.count:", len(result.items))
+        if result.usage is None:
+            raise RuntimeError("missing usage for completed turn")
+        print("usage.thread_id:", result.usage.thread_id)
+        print("usage.turn_id:", result.usage.turn_id)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())