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Harvests PR #3013 by @cyq1017 and PR #3053 by @angus-guo. Legacy deepseek/deepseek-tui binaries now return migration steps instead of trying to self-update through a missing codewhale binary, and the README/rebrand docs carry the same upgrade path. Co-authored-by: cyq1017 <61975706+cyq1017@users.noreply.github.com> Co-authored-by: gus <217034332+angus-guo@users.noreply.github.com>