Move goal weights into BehaviorDef so a pack can rebalance decisions without a fork.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/HSchool.Content/PeopleDefs.cs

@@ -215,12 +215,13 @@ public sealed class StaffingDef : Def
 
 /// <summary>
 /// One school's behaviour numbers: when a need is urgent, how fast lessons teach, commute slack,
-/// and how much a new goal must beat the current one before a person switches. A catalog may have
-/// only one concrete ruleset.
+/// how much a new goal must beat the current one before a person switches, and the four goal
+/// weights the decision planner compares. A catalog may have only one concrete ruleset. Missing
+/// weights keep today's numbers so a pack without them does not empty the classrooms.
 /// </summary>
 public sealed class BehaviorDef : Def
 {
-    /// <summary>A need at or below this value is urgent. Phase 21 turns that into a goal weight.</summary>
+    /// <summary>A need at or below this value is urgent. The planner turns that into a goal weight.</summary>
     public float NeedThreshold { get; init; }
 
     /// <summary>Skill points a lesson adds per game hour, before traits and need state.</summary>
@@ -233,6 +234,22 @@ public sealed class BehaviorDef : Def
 
     /// <summary>A new goal must beat the current one by this much before the person switches.</summary>
     public float SwitchMargin { get; init; }
+
+    /// <summary>Lesson or posted work. Beats leisure and a need that only just crossed the threshold.</summary>
+    public float DutyLessonWeight { get; init; } = 10f;
+
+    /// <summary>Walk to the next room on a break. Beats chatting in the corridor you are standing in.</summary>
+    public float DutyTravelWeight { get; init; } = 5f;
+
+    /// <summary>Need at zero. Beats a lesson so a desperate toilet trip leaves class.</summary>
+    public float NeedWeightAtZero { get; init; } = 20f;
+
+    /// <summary>
+    /// A sitting during this parallel's own lunch break. Above <see cref="DutyTravelWeight"/> so
+    /// lunch beats walking on to the next room, below <see cref="DutyLessonWeight"/> so it never
+    /// pulls anybody out of a lesson.
+    /// </summary>
+    public float LunchWeight { get; init; } = 6f;
 }
 
 public enum BodyAttributeKind