#446 (agent selection + bulk actions) already merged, which
removed the per-card R3ST4RT/ST0P/etc buttons entirely. So the
frontend half of the original #445 (lift the c.is_manager gate
around the per-card stop button) is now redundant — there ARE
no per-card buttons left, and the selection bar's ST0P button is
already manager-aware.
What remains and what this commit ships: the host-side guard in
`dashboard.rs::post_kill` that rejects stop on the manager with
"kill: refusing to stop the manager". Removed.
Rationale: hive-c0re owns the dashboard server, so stopping the
manager has no dashboard disruption. Per-agent approvals submitted
by other sub-agents still process through the host-side approval
queue without the manager up, and operator-driven meta-input
updates work from the dashboard either way. The MCP-surface
self-kill guard in `manager_server.rs::ManagerRequest::Kill` stays
in place: a manager calling Kill on its own container is
self-suicide mid-call, not a legitimate operator action; the
guard prevents that footgun.
Destroy / purge guards (`actions.rs:578` — "refusing to destroy
the manager") stay in place; mara's ask was specifically about
stop, and destroying the manager is a much bigger blast radius.
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