swarmctl CLI gains --tls/--cert/--key/--client-ca flags. With --tls the
controller runs uvicorn under HTTPS + mTLS (CERT_REQUIRED) so worker
heartbeats can reach it cross-host. Default is still 127.0.0.1 plaintext
for backwards compat with the master-CLI enrollment flow.
Auto-issue path (no --cert/--key given): a server cert signed by the
existing DECNET CA is issued once and parked under ~/.decnet/swarmctl/.
Workers already ship that CA's ca.crt from the enroll bundle, so they
verify the endpoint with no extra trust config. BYOC via --cert/--key
when the operator wants a publicly-trusted or externally-managed cert.
The auto-cert path is idempotent across restarts to keep a stable
fingerprint for any long-lived mTLS sessions.
anti
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