fix: scope peribolos concurrency per ref

[toddbaert]

Small addendum to #555, so that we don't share concurrency across ALL runs (just per branch).

[coderabbitai]

📝 Walkthrough

Walkthrough

Modified the concurrency configuration in the peribolos GitHub Actions workflow file, replacing cancel-in-progress: false with queue: max under the peribolos concurrency group, along with updated explanatory comments.

Changes

Workflow Concurrency Update

Layer / File(s)	Summary
Queue-based concurrency configuration .github/workflows/peribolos.yaml	Replaced cancel-in-progress: false with queue: max under the peribolos concurrency group and updated comments to reflect that pending runs are queued rather than cancelled.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Related Issues: None specified

Related PRs: None specified

Suggested Labels: ci, github-actions

Suggested Reviewers: None specified

Poem
A rabbit hops through YAML lines,
Where "cancel" once left telltale signs,
Now queues line up, patient and neat,
No run discarded, all runs complete,
A tiny change, but tidy and fine! 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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.
Title check	✅ Passed	The title is about the concurrency change, though it emphasizes per-ref scoping more than the queueing update.
Description check	✅ Passed	The description is directly related to the workflow concurrency change and the shift from shared to branch-scoped runs.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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