simulate_scenario

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Models the P&L impact of exchange rate moves on the user's current net exposure (invoices + cash) and existing hedges. Four modes: (1) supply explicit `scenarios` for a linear what-if, e.g. 'What happens if GBP/EUR moves 3% before Q3 close?'; (2) set `worst_case: true` (scenarios optional) to revalue each currency at its OWN worst adverse 30-day historical move, the same worst-case the Monitor dashboard shows; (3) `adverse_pct` for one uniform move against every position; (4) `base_move_pct` for the base currency moving against all foreign currencies (negative = base weaker). Worst-case is a historical realised downside, not a forecast or a recommendation. Cross-currency pairs (neither leg is the reporting currency) are shocked base-neutrally.