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: 3719b039-ef04-4f2b-96ab-48343d23acde

📥 Commits

Reviewing files that changed from the base of the PR and between 0453fba and d2110ac.

📒 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 that make bench passes the correct -run regex to go test, ensuring benchmarks run without executing unit tests.

Changes:

• Escape $ correctly in the bench target by changing -run=^$ to -run=^$$.

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