Setsuna-Kitahara/dsh-session-lock

A lock button on every sidebar session row; archiving a locked session through the client-side workspaces.archiveSession — the ⋮ menu, or another plugin calling the same client method — is refused with a notice, the lock list is persisted on the host, and a host route bulk-archives inactive sessions while always skipping locked ones. Calls that reach the host registry directly are not intercepted.