Enhance AI and simulation components with presence management and routing capabilities

- Introduced the `HSchool.Ai` project, responsible for routing, day plans, and presence management.
- Updated the `HSchool.Simulation` project to integrate with the new AI functionalities, improving decision-making and presence tracking.
- Added `travelMinutes` to room and territory definitions, ensuring accurate movement calculations within the simulation.
- Enhanced the `School` class to manage presence and implement empty-time skipping functionality.
- Updated documentation to reflect the new AI features and their impact on school simulation.
- Added tests for presence management and routing to ensure robust functionality and reliability.

src/HSchool.Content/CatalogLoader.cs

@@ -468,6 +468,19 @@ public sealed class CatalogLoader
             {
                 throw new ContentLoadException($"RoomDef '{room.DefName}' is not a homeroom and cannot set seatThing or defaultSeats.");
             }
+
+            if (!room.Abstract && room.TravelMinutes <= 0)
+            {
+                throw new ContentLoadException($"RoomDef '{room.DefName}' travelMinutes must be positive.");
+            }
+        }
+
+        foreach (var territory in catalog.Territories.Values)
+        {
+            if (!territory.Abstract && territory.TravelMinutes <= 0)
+            {
+                throw new ContentLoadException($"TerritoryDef '{territory.DefName}' travelMinutes must be positive.");
+            }
         }
 
         PeopleDefValidator.Validate(catalog);