Archived-session manager for DeepSeek Harness

Key features

• Lists archived sessions that still have a durable log on disk (disk is the source of truth — no ghost rows from the in-memory session store).
• No platform “delete session” service exists.
• Shows title, creation time, working directory and whether the session is currently open in memory.
• Restoremoves a session out of the archive set
• it reappears in the sidebar.