show recipes visually instead of describing them in text

src/lib/sim/ProductionRules.h

@@ -44,6 +44,12 @@ std::map<std::string, int> computeShipyardRequiredMaterials(
     const GameConfig& config, const std::string& recipeId,
     const std::optional<ShipLayoutConfig>& shipLayout);
 
+// The ship's base production time plus that of every module in the configured layout
+// (REQ-MOD-PRODUCTION-TIME), over a stored configuration as above.
+double computeShipyardProductionTimeSeconds(
+    const GameConfig& config, const std::string& recipeId,
+    const std::optional<ShipLayoutConfig>& shipLayout);
+
 // True when a production cycle could start right now, ignoring output-buffer space.
 bool hasInputsToStart(const GameConfig& config, const Building& b);