calculateOffensiveSkillAdjustment
Calculates the offensive skill adjustment multiplier.
skillAdjustment = 2^((weaponSkillLevel - mobLevel) / OFFENSIVE_SKILL_SCALING_RATE)
When skill level matches mob level, returns 1.0 (baseline). When skill level is higher, returns >1.0 (bonus damage). When skill level is lower, returns <1.0 (reduced damage).
Return
The skill adjustment multiplier
Parameters
weaponSkillLevel
The player's weapon skill level
mobLevel
The elite mob's level