feat: report SDK version to cloud API and surface upgrade hints#21

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k-taro56 wants to merge 3 commits intomainfrom

Commits on Apr 27, 2026

feat: integrate deprecation handling and SDK version reporting
k-taro56
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test(e2e): add end-to-end tests for `arkor whoami` with SDK version gate
k-taro56
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test(e2e): add regression test for 426 status handling in `arkor whoami`
k-taro56
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