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

sdk/python/tests/test_app_server_run.py

@@ -96,6 +96,7 @@ def test_run_params_and_usage_cross_app_server_boundary(tmp_path) -> None:
         "request_model": "mock-model-override",
         "usage": {
             "last": {
+                "cacheWriteInputTokens": 0,
                 "cachedInputTokens": 3,
                 "inputTokens": 11,
                 "outputTokens": 7,
@@ -103,6 +104,7 @@ def test_run_params_and_usage_cross_app_server_boundary(tmp_path) -> None:
                 "totalTokens": 18,
             },
             "total": {
+                "cacheWriteInputTokens": 0,
                 "cachedInputTokens": 3,
                 "inputTokens": 11,
                 "outputTokens": 7,