fix: defensive hardening — NaN guards, cast loop safety, discipline reset on new loop, spire mode maxFloorReached fix

src/lib/game/stores/discipline-slice.ts

@@ -56,6 +56,7 @@ export interface DisciplineStoreActions {
     unlockedEffects: string[];
   };
   setPracticingCallbacks(callbacks: { onStartPracticing: () => void; onStopPracticing: () => void }): void;
+  resetDisciplines: () => void;
 }
 
 export type DisciplineStore = DisciplineStoreState & DisciplineStoreActions;
@@ -146,6 +147,16 @@ export const useDisciplineStore = create<DisciplineStore>()(
         set({ practicingCallbacks: callbacks });
       },
 
+      resetDisciplines() {
+        set({
+          disciplines: {},
+          activeIds: [],
+          concurrentLimit: MAX_CONCURRENT_DISCIPLINES,
+          totalXP: 0,
+          processedPerks: [],
+        });
+      },
+
       processTick(mana) {
         const s = get();
         let rawMana = mana.rawMana;