Trying to persuade the Illinois Supreme Court to extend the implied warranty of habitability beyond the remedy’s original target (developer-vendors of newly constructed residences) to subcontractors — even though the subcontractors didn’t have a contractual relationship with the buyers of units in an allegedly leaky condominium building — the Sienna Court Condo Association relied on analogies to a tort that doesn’t require contractual privity between plaintiffs and defendants: personal-injury …