The post-task follow-up hook resumes the finished conversation and its own
reply used to end with the same DONE marker as the original task, which also
meant it silently overwrote doneMarker (the resumed reply is the new last
message) with a false value once the wording stopped matching. It now ends
with a distinct COMPLETED marker, and _resolve_state() accepts either marker
for the finished state so this can't regress a conversation back to running.
The already-fired post-task hook's meta.hooks["post-task"] timestamp now
also drives a round green completion stamp on conversation cards (home
rail/drawer + the browsable conversations list), as a visual complement to
the plain emerald finished dot: it marks that a task was tidied up after,
not just finished.
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