The swarmctl API already exposes POST /swarm/check — an active mTLS
probe that refreshes SwarmHost.status + last_heartbeat for every
enrolled worker. The CLI was missing a wrapper, so operators had to
curl the endpoint directly (which is how the VM validation run did it,
and how the wiki Deployment-Modes / SWARM-Mode pages ended up doc'ing
a command that didn't exist yet).
Matches the existing list/enroll/decommission pattern: typer subcommand
under swarm_app, --url override, Rich table output plus --json for
scripting. Three tests: populated table, empty-swarm path, and --json
emission.
anti
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