feat(transport): Add EnvelopePrinterTransport for debug logging #6181

Bugbot Review

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

Request ID: serverGenReqId_389efe46-b5bf-4fb2-993a-cb578528f990

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit f050b85. Configure here.}