Mechanical addition to the existing bulk-action framework
(renderSelectionBar/addBulkButton, swarm.js) -- two per-agent actions
already exist (POST /api/pause/, /api/resume/, see hive-agent-menu.js),
this just gives the selection bar the same all-or-nothing enablement
rule the other six bulk buttons already use (pause enabled only when
none of the selection is already paused, and vice versa for resume).
.btn-pause reuses .badge-paused's yellow so the trigger and the
resulting state pill read as one colour; .btn-resume is green like
.btn-start (both are "go" actions). Docs updated to list both in the
Selection bar reference.
4af890f01d