feat: add goleak test coverage

[ankurs]

Summary

• Add goleak.VerifyTestMain to catch goroutine leaks in tests

Test plan

• make test passes with goleak enabled
• make lint clean

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 668be896-f3a5-42b3-b5c6-2f70a200cfd1

📥 Commits

Reviewing files that changed from the base of the PR and between dfc0e86 and 48f6d7e.

📒 Files selected for processing (2)

• go.mod
• goleak_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/goleak

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[Copilot]

Pull request overview

Adds goroutine leak detection to the tracing package test suite by wiring goleak.VerifyTestMain into TestMain.

Changes:

• Introduce TestMain in goleak_test.go to run goleak.VerifyTestMain(m) for the package’s tests.
• Add go.uber.org/goleak v1.3.0 as a direct dependency in go.mod.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
goleak_test.go	Adds package-level TestMain to enable goleak checks during go test.
go.mod	Declares goleak as a direct requirement to support the new test harness.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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