…9491)

This is an automated backport of #9435 to the release-v5.0 branch.

---------

Co-authored-by: ellispinsky <48781372+ellispinsky@users.noreply.github.com>
Co-authored-by: Lars Grammel <lars.grammel@gmail.com>

… code-execution-20250825 to download output files (#9669)

## Background

The Anthropic code execution bash tool provides a list of the generated
files. This feature was missing from #9435 (although present in the zod
schemas). It enables downloading generated files from the Anthropic API.

## Summary

- add response property `file_id `in code-execution-20250825
- add example downloading file.

## Example

Use code execution to have the AI ​​create an Excel file. Get the
executed python code.

![anthropic_code_execution_file_download](https://github.com/user-attachments/assets/840eee84-2cf8-4710-8ba3-a03824c3fe04)

prompt:

`Write a Python script to calculate fibonacci number and then execute it
to find the 10th fibonacci number finally output data to excel file and
python code.`

## Manual Verification

### package/anthropic
- packages/anthropic/src/anthropic-messages-language-model.test.ts
- add fixtures `anthropic-code-execution-20250825.2` for file_id return
pattern.
  - check the snapshot and file_id was included in the result.

### examples/ai-core
- add the examples,
src/stream-text/anthropic-code-execution-20250825-downloads.ts
- add the examples,
src/generate-text/anthropic-code-execution-20250825-downloads.ts

### examples/next-openai
- fix /components/tool/anthropic-code-execution-view.tsx (add a download
button)
- add route for submit native download api and provide files.
/app/api/code-execution-files/anthropic/[file]/route.ts

## Checklist

- [x] Tests have been added / updated (for bug fixes / features)
- [ ] Documentation has been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] Formatting issues have been fixed (run `pnpm prettier-fix` in the
project root)
- [x] I have reviewed this pull request (self-review)

## Related Issues

Fixes gap from #9435

---------

Co-authored-by: tsuzaki430 <tsuzaki430@users.noreply.github.com>
Co-authored-by: Lars Grammel <lars.grammel@gmail.com>