Session row menu actions that the Web UI does not ship: Delete conversation permanently removes the session directory, its projection cache and its archived/pinned bookkeeping in the workspace file, and cascades to the subagent sessions that session spawned; the delete is refused while the target session or any of its children is running. The same menu also copies the raw session id.
This plugin has not published an npm package, so the store does not offer an install command yet. Use the repository link below to view the source.