fix: gofmt formatting in connection_pool_test.go

[Copilot]

CI lint was failing because internal/launcher/connection_pool_test.go had extra alignment spaces before an inline comment, which gofmt does not permit.

Change

// Before
IdleTimeout: 1 * time.Hour,         // long — won't trigger idle cleanup

// After
IdleTimeout: 1 * time.Hour, // long — won't trigger idle cleanup

Original prompt

Fix the failing GitHub Actions workflow lint
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 67161682528
Job URL: https://github.com/github/gh-aw-mcpg/actions/runs/23123419039/job/67161682528

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