CI: add arm linux runner, use the big mac runner

[grahamc]

Summary by CodeRabbit

• Chores
  • Updated continuous integration checks to run on newer, higher-capacity build environments.
  • Added ARM-based Linux coverage for improved platform validation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 84db5132-364a-4531-847f-0ff138280593

📥 Commits

Reviewing files that changed from the base of the PR and between 79ac5d1 and f8b21cb.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

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📝 Walkthrough

Walkthrough

The CI checks matrix now uses an ARM Ubuntu runner and a large macOS runner. It replaces the standard macOS runner.

Changes

CI runner matrix

Layer / File(s)	Summary
Update CI runners .github/workflows/ci.yml	The checks job replaces macos-latest with UbuntuLatest32Cores128GArm and macos-latest-xlarge.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the CI runner changes by identifying the ARM Linux runner and larger macOS runner.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch push-qptnnwlypstq

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