@type t() :: %Srd.Content.Armor{
  base_ac: non_neg_integer(),
  category: category(),
  name: String.t(),
  slug: String.t(),
  stealth_disadvantage: boolean(),
  strength: non_neg_integer() | nil
}

An SRD armor:

• :slug - stable identifier used for lookup
• :name - display name
• :category - light, medium, heavy, or shield
• :base_ac - the base Armor Class (for a shield, the bonus it grants)
• :strength - the minimum Strength score the armor requires, or nil
• :stealth_disadvantage - whether wearing it gives disadvantage on Stealth