Vaibhav Srivastav 0ebe69a8c3 [codex] Update imagegen system skill (#18852) ...

## Summary

This updates the embedded `imagegen` system skill in `codex-rs/skills`
with the ImageGen 2 skill changes from `openai/skills-internal#87`.

The bundled skill now keeps normal image generation/editing on the
built-in `image_gen` path, updates the CLI fallback defaults to
`gpt-image-2`, and routes explicit transparent-output requests through
`gpt-image-1.5` with clear guidance that `gpt-image-2` does not support
transparent backgrounds.

## Details

- Update `SKILL.md` routing guidance for built-in vs CLI fallback
behavior.
- Update CLI/API references for `gpt-image-2` size constraints, quality
options, near-4K sizes, and unsupported options.
- Update `scripts/image_gen.py` defaults and validation:
  - default model `gpt-image-2`
  - default size `auto`
  - default quality `medium`
  - reject transparent backgrounds on `gpt-image-2`
  - reject `input_fidelity` on `gpt-image-2`
- validate flexible `gpt-image-2` sizes and suggest `3824x2160` /
`2160x3824` for near-4K requests
- Update prompt/reference docs with the new model and routing guidance.

## Validation

- `cargo test -p codex-skills`
- `git diff --check`
- Manual CLI dry-runs for:
  - default `gpt-image-2` payload
  - `3824x2160` near-4K size acceptance
  - `3840x2160` rejection with near-4K guidance
  - transparent background rejection on `gpt-image-2`
  - transparent background acceptance on `gpt-image-1.5`
  - `input_fidelity` rejection on `gpt-image-2`

Bazel target check was not run locally because `bazel` is not installed
in this environment.

2026-04-22 15:08:10 +00:00

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