delegate_task to a linked environment launches an ordinary thread there,
marked delegatedFrom, so a client connected to both machines listed it in
the sidebar as well as in the parent's lineage panel. Its approvals and
questions also never reached the parent here.

Lists now treat such a thread as a subagent when the client also lists
the thread that delegated it: the web sidebar and its project ordering,
mobile's thread lists, and notifications leave it out. A parent here is
flagged, and shows the "subagent needs input" banner, when the task or
one of its own subagents there asks. A task whose parent the client
cannot list (that machine switched off, or the parent gone) stays listed
on its own, so its work is never out of reach.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>