Add Python SDK public API and examples

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

sdk/python/examples/README.md

@@ -0,0 +1,78 @@
+# Python SDK Examples
+
+Each example folder contains runnable versions:
+
+- `sync.py` (public sync surface: `Codex`)
+- `async.py` (public async surface: `AsyncCodex`)
+
+All examples intentionally use only public SDK exports from `codex_app_server`.
+
+## Prerequisites
+
+- Python `>=3.10`
+- Install SDK dependencies for the same Python interpreter you will use to run examples
+
+Recommended setup (from `sdk/python`):
+
+```bash
+python -m venv .venv
+source .venv/bin/activate
+python -m pip install -U pip
+python -m pip install -e .
+```
+
+When running examples from this repo checkout, the SDK source uses the local
+tree and does not bundle a runtime binary. The helper in `examples/_bootstrap.py`
+therefore resolves `codex` from:
+
+- `CODEX_PYTHON_SDK_CODEX_BIN`, if set
+- otherwise `codex` on `PATH`
+
+## Run examples
+
+From `sdk/python`:
+
+```bash
+python examples/<example-folder>/sync.py
+python examples/<example-folder>/async.py
+```
+
+The examples bootstrap local imports from `sdk/python/src` automatically, so no
+extra package build step is required beyond installing dependencies for your
+active interpreter and making a `codex` binary available.
+
+## Recommended first run
+
+```bash
+python examples/01_quickstart_constructor/sync.py
+python examples/01_quickstart_constructor/async.py
+```
+
+## Index
+
+- `01_quickstart_constructor/`
+  - first run / sanity check
+- `02_turn_run/`
+  - inspect full turn output fields
+- `03_turn_stream_events/`
+  - stream and print raw notifications
+- `04_models_and_metadata/`
+  - read server metadata and model list
+- `05_existing_thread/`
+  - resume a real existing thread (created in-script)
+- `06_thread_lifecycle_and_controls/`
+  - thread lifecycle + control calls
+- `07_image_and_text/`
+  - remote image URL + text multimodal turn
+- `08_local_image_and_text/`
+  - local image + text multimodal turn using bundled sample image
+- `09_async_parity/`
+  - parity-style sync flow (see async parity in other examples)
+- `10_error_handling_and_retry/`
+  - overload retry pattern + typed error handling structure
+- `11_cli_mini_app/`
+  - interactive chat loop
+- `12_turn_params_kitchen_sink/`
+  - one turn using most optional `turn(...)` params (sync + async)
+- `13_model_select_and_turn_params/`
+  - list models, pick highest model + highest supported reasoning effort, run turns, print message and usage