improvement(codebase): centralize test mocks, extract @sim/utils, remove dead code #4228

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_67420e50-b5a7-41b1-bee0-bae3129756dd

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 6a0db71. Configure here.}