Optionalinput: ProjectCommandJsonValueExecute one operation from the host-owned connector catalog. The provider
and operation ids are selectors only: main resolves their pack, validates
input, applies account-scoped authority and confirmation, and owns the
credential/provider boundary.
The generic connector call form (§18.4):
connectors.call(providerId, resource, op, input). It rides the SAME wire envelope as the typed per-provider namespaces — both spellings resolve to one dispatchable wire method — so a caller can reach any registered provider's operation without a generated namespace. The typedconnectors.google.*namespaces stay for back-compat and rich DTO types; this is the open, provider-parametric door.