Charlie Guo b7f8e9195a Add OpenAI Docs skill (#13596) ...

## Summary
- add the OpenAI Docs skill under
codex-rs/skills/src/assets/samples/openai-docs
- include the skill metadata, assets, and GPT-5.4 upgrade reference
files
- exclude the test harness and test fixtures

## Testing
- not run (skill-only asset copy)

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..

src

Add OpenAI Docs skill (#13596)

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BUILD.bazel

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build.rs

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Cargo.toml

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