Prepare Python SDK 0.147.0 stable release (#39155)

## What changed

- Pin `openai-codex` to the `0.147.0` CLI runtime and regenerate its protocol models and lockfile.
- Allow stable Python SDK release tags and require their versions to match the pinned runtime.
- Expose the regenerated API additions, including thread sections, environment connection notifications, audio inputs, and the `section_id` thread-list filter.

## Testing

- Update release staging, generated-contract, notification, and public-signature coverage for the new runtime.

GitOrigin-RevId: 8b99ef6781e01c34d9d697c8c44247fb4e4fe3ab

.github/workflows/python-sdk-release.yml

@@ -38,10 +38,10 @@ jobs:
           from pathlib import Path
 
           sdk_version = os.environ["GITHUB_REF_NAME"].removeprefix("python-v")
-          if not re.fullmatch(r"[0-9]+\.[0-9]+\.[0-9]+b[0-9]+", sdk_version):
+          if not re.fullmatch(r"[0-9]+\.[0-9]+\.[0-9]+(?:b[0-9]+)?", sdk_version):
               raise SystemExit(
-                  "Python SDK release tags must identify a beta release, "
-                  "for example python-v0.1.0b1."
+                  "Python SDK release tags must identify a stable or beta release, "
+                  "for example python-v0.147.0 or python-v0.1.0b1."
               )
 
           pyproject = tomllib.loads(Path("sdk/python/pyproject.toml").read_text())
@@ -56,6 +56,11 @@ jobs:
                   f"Expected exactly one pinned {prefix} dependency, found {runtime_versions}"
               )
 
+          if "b" not in sdk_version and sdk_version != runtime_versions[0]:
+              raise SystemExit(
+                  f"Stable SDK version {sdk_version} must match pinned runtime {runtime_versions[0]}."
+              )
+
           with Path(os.environ["GITHUB_OUTPUT"]).open("a") as output:
               print(f"runtime_version={runtime_versions[0]}", file=output)
               print(f"sdk_version={sdk_version}", file=output)