fix: escape $ in Makefile bench target

[ankurs]

Summary

• Use ^$$ instead of ^$ in Makefile bench target so Make passes a literal $ to the shell, giving go test -run the correct regex ^$ (match no test names).

Test plan

• make bench runs benchmarks only, no unit tests

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b7554ce0-9cd0-438a-9e84-182ac18d1322

📥 Commits

Reviewing files that changed from the base of the PR and between 51d779f and d49d3c9.

📒 Files selected for processing (1)

• Makefile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/makefile-bench-regex

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[Copilot]

Pull request overview

This PR fixes the bench Makefile target so make passes a literal $ through to the shell, ensuring go test -run receives the intended regex ^$ (match no test names) and therefore runs benchmarks only.

Changes:

• Update bench target from -run=^$ to -run=^$$ so Makefile escaping results in a literal $ at execution time.

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