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

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

src/HSchool.Server/mods/core/defs/behavior/rules.jsonc

@@ -1,6 +1,6 @@
 {
   "defName": "Behavior",
-  // A need at or below this is urgent. Phase 21 turns that into a goal weight.
+  // A need at or below this is urgent. The planner turns that into a goal weight.
   "needThreshold": 0.35,
   // Skill points a lesson adds per game hour, before traits and need state.
   "lessonSkillPerHour": 0.05,
@@ -9,4 +9,16 @@
   "commuteSlackMin": 0,
   "commuteSlackMax": 6,
   "switchMargin": 0.15,
+  // Lesson or posted work. Beats leisure (3) and a need that only just crossed
+  // the threshold; a toilet at zero (20) still leaves class.
+  "dutyLessonWeight": 10,
+  // Walk to the next room on a break. Beats chatting in the corridor you are
+  // standing in; below lunch so a sitting still pulls people to the canteen.
+  "dutyTravelWeight": 5,
+  // Need at zero. Beats a lesson so a desperate toilet trip leaves class.
+  "needWeightAtZero": 20,
+  // A sitting during this parallel's own lunch break. Above travel so lunch
+  // beats walking on to the next room, below the lesson so it never pulls
+  // anybody out of class. Raise it past dutyLessonWeight and they will.
+  "lunchWeight": 6,
 }