dsh-shuttle: Bidirectional migration of chat history between DSH, Codex, and Claude Code.

# Introduction If you use Codex, Claude Code, Pi, Reasonix, OpenCode, and DSH simultaneously, you will encounter a specific issue: chat logs are scattered across the storage of each individual tool, with formats that are incompatible with one another. If you wish to continue a previous conversation within DSH, or transfer a DSH session to another tool for continued use, you are essentially limited to manual organization. The dsh-shuttle introduced below solves exactly this problem. It is a DeepSeek Harness plugin that also provides an offline CLI for bidirectional migration of chat logs between DSH and these five types of tools. DSH's philosophy is that "everything is a plugin"; capabilities like conversation migration are integrated as plugins rather than modifying DSH itself. # What is it