OptionalallowADR-0015: acknowledge applies that withdraw a currently-routable hostname
(access renamed/deleted, primary reassigned, custom removed). Rides to
the declaration-apply body key allowHostnameRemoval. Without it such an
update fails 409 HOSTNAME_REMOVAL_BLOCKED; the create path never trips it.
OptionalappLimit to a single application by metadata.name.
OptionaldocumentsAlready-parsed canonical documents (e.g. from loadStackFile).
OptionaldryPlan only — resolves the deploy order without any API call.
OptionalenvEnv record for ${VAR} substitution when yaml is given (default {}).
OptionalyamlRaw multi-document stack YAML, parsed with parseStackDocuments.
Stack source: pre-parsed documents, or raw YAML + substitution env.