Add Python SDK public API and examples

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

sdk/python/examples/08_local_image_and_text/sync.py

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+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()
+
+from codex_app_server import Codex, LocalImageInput, TextInput
+
+IMAGE_PATH = Path(__file__).resolve().parents[1] / "assets" / "sample_scene.png"
+if not IMAGE_PATH.exists():
+    raise FileNotFoundError(f"Missing bundled image: {IMAGE_PATH}")
+
+with Codex(config=runtime_config()) as codex:
+    thread = codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
+
+    result = thread.turn(
+        [
+            TextInput("Read this local image and summarize what you see in 2 bullets."),
+            LocalImageInput(str(IMAGE_PATH.resolve())),
+        ]
+    ).run()
+
+    print("Status:", result.status)
+    print(result.text)