DeepSeekHarness Session Delete: Adding Delete Functionality to Sidebar Sessions

The DeepSeek Harness sidebar lacks a session deletion feature, making management cumbersome. The dsh-session-clean plugin, developed by Ansellwan, solves this problem. It supports fully deleting sessions, including archived ones, through the sidebar menu. Active sessions are automatically grayed out, and deletion is blocked. The plugin does not access external networks and operates locally only, but deletions are irreversible. The installation command is `dsh plugin --profile desktop add dsh-session-clean`.