Replaces the yellow Radio glyph from #14205 with a static dot in a new
--agent-monitoring token (#8abeb7), defined once for light and once for
dark like --workspace-status-done, so the status keeps its identity when
the theme flips. Deliberately a fixed UI value: it never reads terminal
theme state at runtime.
Adds the turn-boundary notification pins. The monitoring predicate and
the turnCompletedAt stamp are computed from the same "lead said done but
the pane resolves to working" expression, so a rename can silently drop
the stamp and kill a completion notification that works today with
nothing else going red.
Brennan Benson
76f77bf811