## Summary
- Move approval-mode mapping into
`sdk/python/src/openai_codex/_approval_mode.py`.
- Move initialize metadata parsing and normalization into
`sdk/python/src/openai_codex/_initialize_metadata.py`.
- Keep the public `ApprovalMode` export stable and retarget direct
metadata helper coverage.
## Integration coverage
- Add an app-server harness smoke that exercises sync and async SDK
initialization plus thread creation.
## Validation
- Local tests were not run per repo guidance. CI should validate this
branch once the PR is online.
Ahmed Ibrahim