Map an array of StakeholderPerspective objects to a simple influence ranking.
Returns stakeholder types sorted by severity (high → medium → low), then by
impact direction (negative before positive, as negative impacts require more
political attention).
Map an array of StakeholderPerspective objects to a simple influence ranking. Returns stakeholder types sorted by severity (high → medium → low), then by impact direction (negative before positive, as negative impacts require more political attention).