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/Defs.cs

@@ -77,10 +77,17 @@ public sealed class RoomDef : Def
 
     /// <summary>Editor default when placing a new homeroom. Vanilla classrooms are 16.</summary>
     public int DefaultSeats { get; init; }
+
+    /// <summary>Game minutes spent occupying this room when walking through it.</summary>
+    public float TravelMinutes { get; init; }
 }
 
 public sealed class BuildingDef : Def;
 
 public sealed class FloorDef : Def;
 
-public sealed class TerritoryDef : Def;
+public sealed class TerritoryDef : Def
+{
+    /// <summary>Game minutes spent occupying the yard when walking through it.</summary>
+    public float TravelMinutes { get; init; }
+}