[5/8] Rename Python SDK package to openai-codex (#21905)

## Why

The SDK should publish under the reserved public distribution name
`openai-codex`, and its import module should match that name in the
Python style. Since package names can contain hyphens but import modules
cannot, the public import path becomes `openai_codex`.

Keeping the rename separate from the public API surface change makes the
naming change easy to review and avoids mixing it with API curation.

## What

- Rename the SDK distribution from `openai-codex-app-server-sdk` to
`openai-codex`.
- Rename the import package from `codex_app_server` to `openai_codex`.
- Keep the runtime wheel as the separate `openai-codex-cli-bin`
dependency.
- Update docs, examples, notebooks, artifact scripts, lockfile metadata,
and tests for the new distribution/module names.

## Stack

1. #21891 `[1/8]` Pin Python SDK runtime dependency
2. #21893 `[2/8]` Generate Python SDK types from pinned runtime
3. #21895 `[3/8]` Run Python SDK tests in CI
4. #21896 `[4/8]` Define Python SDK public API surface
5. This PR `[5/8]` Rename Python SDK package to `openai-codex`
6. #21910 `[6/8]` Add high-level Python SDK approval mode
7. #22014 `[7/8]` Add Python SDK app-server integration harness
8. #22021 `[8/8]` Add Python SDK Ruff formatting

## Verification

- Updated package metadata and public API tests to assert the
distribution and import names.

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

sdk/python/pyproject.toml

@@ -3,13 +3,13 @@ requires = ["hatchling>=1.24.0"]
 build-backend = "hatchling.build"
 
 [project]
-name = "openai-codex-app-server-sdk"
+name = "openai-codex"
 version = "0.131.0a4"
 description = "Python SDK for Codex app-server v2"
 readme = "README.md"
 requires-python = ">=3.10"
 license = { text = "Apache-2.0" }
-authors = [{ name = "OpenClaw Assistant" }]
+authors = [{ name = "OpenAI" }]
 keywords = ["codex", "json-rpc", "sdk", "llm", "app-server"]
 classifiers = [
   "Development Status :: 4 - Beta",
@@ -42,14 +42,14 @@ exclude = [
 ]
 
 [tool.hatch.build.targets.wheel]
-packages = ["src/codex_app_server"]
+packages = ["src/openai_codex"]
 include = [
-  "src/codex_app_server/py.typed",
+  "src/openai_codex/py.typed",
 ]
 
 [tool.hatch.build.targets.sdist]
 include = [
-  "src/codex_app_server/**",
+  "src/openai_codex/**",
   "README.md",
   "CHANGELOG.md",
   "CONTRIBUTING.md",