Approximate Power contribution of one class ability while it is EQUIPPED
(BAL-030’s q). The ability’s damage or heal payload is already priced
inside P_static; this is the utility half — a damage window, a cooldown
cut, a team buff — that no closed-form stat can express.
The always-on rule a class plays with (BAL-033). One per class: it is the
half of class identity that is not a stat, so it must be readable from the
class alone rather than inferred from what the character happens to wear.