feat: add step3p5 for cce

[NanoCode012]

Description

Add support in CCE for https://huggingface.co/stepfun-ai/Step-3.5-Flash

Motivation and Context

How has this been tested?

AI Usage Disclaimer

Screenshots (if appropriate)

Types of changes

Social Handles (Optional)

Summary by CodeRabbit

Release Notes

• Chores

  • Updated cut-cross-entropy dependency reference.

• Documentation

  • Updated installation commands across notebooks, scripts, and documentation.
  • Added new plugin entry to usage examples.

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📝 Walkthrough

Walkthrough

This PR updates the pinned git commit hash for the cut-cross-entropy dependency from f4b5712 to 0d4ce4b across installation instructions, scripts, and integration files. Additionally, a new plugin entry is added to the README usage documentation.

Changes

Cohort / File(s)	Summary
Cut-cross-entropy commit hash update examples/colab-notebooks/colab-axolotl-example.ipynb, scripts/cutcrossentropy_install.py, src/axolotl/integrations/cut_cross_entropy/__init__.py	Updated git commit reference from f4b5712 to 0d4ce4b for cut-cross-entropy dependency installation.
Cut-cross-entropy documentation update src/axolotl/integrations/cut_cross_entropy/README.md	Updated installation command commit hash from f4b5712 to 0d4ce4b and added new plugin entry step3p5 to usage examples.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• use latest version of cce fork for SP fix #2871: Updates cut-cross-entropy git commit hash across installation files (scripts, README, init.py).
• feat: add new cce support for GLM4.7 Flash, GLM Image, GLM4.6v and exaone4 #3373: Modifies cut-cross-entropy install references to update ml-cross-entropy git commit hash across notebook, script, README, and init.py.
• feat: upgrade cce commit to include smollm3, granite, granitemoe #2993: Updates cut-cross-entropy integration files to change the git commit reference for installation.

Suggested labels

ready to merge

Suggested reviewers

• winglian
• SalmanMohammadi

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add step3p5 for cce' directly reflects the main change: adding support for the Step-3.5-Flash model in the cut-cross-entropy (CCE) integration, which is evident in the README update mentioning step3p5 plugin entry.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/step3p5

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Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@src/axolotl/integrations/cut_cross_entropy/README.md`:
- Line 93: The supported models list in README.md is out of alphabetical order:
move the `step3p5` entry so the sequence around `seed_oss`, `smollm3`,
`step3p5`, `voxtral` is alphabetically correct; specifically ensure `seed_oss`
is followed by `smollm3` and then `step3p5` (adjust the list entries near the
current `seed_oss`/`smollm3`/`voxtral` block to restore proper alphabetical
ordering).

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Fix alphabetical ordering in supported models list.

The model step3p5 is inserted between seed_oss and voxtral, but the list appears to be alphabetically sorted. The correct alphabetical order should be: seed_oss, smollm3, step3p5. Currently, smollm3 appears before seed_oss at line 91-92, which breaks alphabetical sorting.

📝 Proposed fix to restore alphabetical order

 - qwen3_next
+- seed_oss
 - smollm3
-- seed_oss
 - step3p5
 - voxtral

🤖 Prompt for AI Agents

In `@src/axolotl/integrations/cut_cross_entropy/README.md` at line 93, The
supported models list in README.md is out of alphabetical order: move the
`step3p5` entry so the sequence around `seed_oss`, `smollm3`, `step3p5`,
`voxtral` is alphabetically correct; specifically ensure `seed_oss` is followed
by `smollm3` and then `step3p5` (adjust the list entries near the current
`seed_oss`/`smollm3`/`voxtral` block to restore proper alphabetical ordering).

[github-actions]

📖 Documentation Preview: https://69821718bc306719dc4ef2a2--resonant-treacle-0fd729.netlify.app

Deployed on Netlify from commit 9435a43

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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