feat(workflow): generate diff-accurate upgrade-deps PR descriptions via Claude #1402

Bugbot Review

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

Request ID: serverGenReqId_a0f1c99e-50e5-4548-8580-d56a38a0e146

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit f173b91. Configure here.}