Function getModelDeprecationWarning

src/utils/model/deprecation.ts:88–101

(
  modelId: string | null,
)

 * Get a deprecation warning message for a model, or null if not deprecated
 */
export function getModelDeprecationWarning(
  modelId: string | null,
): string | null {
  if (!modelId) {
    return null
  }

  const info = getDeprecatedModelInfo(modelId)
  if (!info.isDeprecated) {
    return null
  }

  return `⚠ ${info.modelName} will be retired on ${info.retirementDate}. Consider switching to a newer model.`
}