fix: SkillsTab barrel export, equipment store reads, LabTab re-export, debug null guards, GrimoireTab loaded state, spire tab switching

src/lib/game/stores/prestigeStore.ts

@@ -66,6 +66,15 @@ export interface PrestigeState {
   
   // Reset
   resetPrestige: () => void;
+  
+  // Debug helpers
+  debugSetSignedPacts: (pacts: number[]) => void;
+  debugSetPactDetails: (details: Record<number, {
+    floor: number;
+    guardianId: string;
+    signedAt: { day: number; hour: number };
+    skillLevels: Record<string, number>;
+  }>) => void;
 }
 
 const initialState = {