ci: install coreutils on macos

[olliewalsh]

the timeout command suddenly disappeared from the macos github runners this afternoon

Summary by Sourcery

CI:

• Install coreutils via Homebrew in the macOS GitHub Actions workflow to restore availability of the timeout command.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the CI workflow to install GNU coreutils on macOS runners so that the timeout command is available again during CI jobs.

File-Level Changes

Change	Details	Files
Ensure macOS CI runners have the timeout utility by installing GNU coreutils via Homebrew.	Extend Homebrew install line in the macOS CI job to include coreutils alongside existing packages. Rely on coreutils providing the timeout command that disappeared from the default GitHub macOS runners.	.github/workflows/ci.yml

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• If this is specifically to restore timeout, consider noting or enforcing the path used in scripts (e.g., gtimeout vs timeout on macOS coreutils) so the CI remains robust even if Homebrew changes the installed binary names.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- If this is specifically to restore `timeout`, consider noting or enforcing the path used in scripts (e.g., `gtimeout` vs `timeout` on macOS coreutils) so the CI remains robust even if Homebrew changes the installed binary names.

## Individual Comments

### Comment 1
<location> `.github/workflows/ci.yml:258` </location>
<code_context>
         shell: bash
         run: |
-           brew install go bats bash jq llama.cpp shellcheck
+           brew install go bats bash jq llama.cpp shellcheck coreutils
            uv run -- make install-requirements

</code_context>

<issue_to_address>
**issue:** Clarify whether GNU coreutils behavior (g-prefixed binaries) is expected in the CI scripts.

On macOS, Homebrew’s `coreutils` installs `g*`-prefixed binaries (e.g., `greadlink`, `gtimeout`) unless `gnubin` is added to `PATH`. Please confirm whether the CI/Makefile scripts assume GNU behavior under the unprefixed names (`readlink`, `timeout`), and if so, either add `coreutils`’ `gnubin` directory to `PATH` or call the `g*` commands explicitly.
</issue_to_address>

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