compute_scenarios

Scenario planning: run the feasibility engine three times (Worst case; Base, the project's actual saved assumptions unchanged; and Best case) and return all three side by side. A lighter alternative to Monte Carlo: three named, concrete stories instead of probability distributions. worst/best only need the fields you want to override; anything you omit defaults to a reasonable starting point (half revenue growth / +5pp discount rate / +5pp churn for Worst, 1.5x growth / -3pp discount rate / -5pp churn for Best, all relative to the project's saved assumptions). Call get_project first to see the saved assumptions those defaults are computed from. Read-only: nothing is saved.