zhukeu2-lang/dsh-takeover

Adds a "Handoff session" item to the session context menu: pick an older session, choose how the new one should read it, and a fresh session is created with the handoff instruction pre-filled in its composer while the old session stays untouched. Three read modes — the AI decides what to read, a six-part summary written into a .md file, or just the last 20 turns. The second tab turns those .md files into a cleanup list grouped by workspace, deletable once the receiving session has run 3 turns or the handoff is 7 days old. All file, record and turn-count operations run in the host process; the browser half only renders and requests. Requires Windows and the DSH desktop app (it uses Electron shell.openPath and explorer.exe/cmd.exe).