fix: data race squashed

[gilescope]

No description provided.

[gemini-code-assist]

Code Review

This pull request resolves a concurrency issue in the proto_enum.go utility by constructing stateful casers (cases.Title and cases.Lower) on each function call rather than sharing global instances across goroutines. It also introduces a concurrent test to verify this safety. The reviewer correctly pointed out a compilation error in the new test, where wg.Go is incorrectly called on a standard sync.WaitGroup instead of using standard goroutines with wg.Add and wg.Done.

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[github-actions]

➖ Are we earthbuild yet?

No change in "earthly" occurrences

📈 Overall Progress

Branch	Total Count
main	5336
This PR	5336
Difference	+0

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