feat(experiments): add gpt-5.5-pro

[Niki2k1]

Adds a gpt-5.5-xhigh experiment using the codex agent with reasoningEffort=xhigh, matching the existing gpt-5.4-xhigh config. Registers it in scripts/export-results.ts and the README models table.

Note

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds support for a new gpt-5.5-xhigh experiment configuration. The change spans three files: a new experiment config file that defines the setup with the codex agent and gpt-5.5?reasoningEffort=xhigh model, a script entry that maps the experiment key to a display name for results export, and a README update that documents the new model in the supported models table.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title states 'feat(experiments): add gpt-5.5-pro' but the actual changes add 'gpt-5.5-xhigh', not 'gpt-5.5-pro'. This is a clear mismatch.	Update the PR title to 'feat(experiments): add gpt-5.5-xhigh' to accurately reflect the experiment being added.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly explains the changes: adding a gpt-5.5-xhigh experiment with specific configuration details and where it's registered.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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