cleanup: delete computed-stats.ts shim and store/index.ts

- Delete src/lib/game/computed-stats.ts (root-level re-export shim)
- Delete src/lib/game/store/index.ts (nothing imports from it)
- Update __tests__/computed-stats.test.ts to import from ../utils instead
- Clean up craftingStore.ts imports (remove unused useGameStore, CraftingApply)

Typecheck and lint pass (pre-existing DisciplinesTab.tsx errors unchanged)

src/lib/game/stores/gameHooks.ts

@@ -1,7 +1,6 @@
 import { useEffect } from 'react';
 import { useGameStore } from './gameStore';
 import { useManaStore } from './manaStore';
-import { useSkillStore } from './skillStore';
 import { usePrestigeStore } from './prestigeStore';
 import { useCombatStore } from './combatStore';
 import { useUIStore } from './uiStore';
@@ -28,17 +27,15 @@ export function useGameLoop() {
 // ─── Shared Selector Hooks for Common Derived State ────────────────────────────
 
 /**
- * Get unified effects from all relevant stores
+ * Get unified effects from equipment only (skills removed)
  */
 export function useUnifiedEffects() {
-  const skillUpgrades = useSkillStore((s) => s.skillUpgrades);
-  const skillTiers = useSkillStore((s) => s.skillTiers);
   const equippedInstances = useCraftingStore((s) => s.equippedInstances);
   const equipmentInstances = useCraftingStore((s) => s.equipmentInstances);
 
   return getUnifiedEffects({
-    skillUpgrades,
-    skillTiers,
+    skillUpgrades: {},
+    skillTiers: {},
     equippedInstances,
     equipmentInstances,
   });
@@ -48,10 +45,7 @@ export function useUnifiedEffects() {
  * Get computed mana stats (maxMana, baseRegen, clickMana, meditationMultiplier, effectiveRegen)
  */
 export function useManaStats() {
-  const skills = useSkillStore((s) => s.skills);
   const prestigeUpgrades = usePrestigeStore((s) => s.prestigeUpgrades);
-  const skillUpgrades = useSkillStore((s) => s.skillUpgrades);
-  const skillTiers = useSkillStore((s) => s.skillTiers);
   const meditateTicks = useManaStore((s) => s.meditateTicks);
   const day = useGameStore((s) => s.day);
   const hour = useGameStore((s) => s.hour);
@@ -59,30 +53,27 @@ export function useManaStats() {
   const equipmentInstances = useCraftingStore((s) => s.equipmentInstances);
 
   const upgradeEffects = getUnifiedEffects({
-    skillUpgrades,
-    skillTiers,
+    skillUpgrades: {},
+    skillTiers: {},
     equippedInstances,
     equipmentInstances,
   });
 
   const maxMana = computeMaxMana(
-    { skills, prestigeUpgrades, skillUpgrades, skillTiers },
+    { skills: {}, prestigeUpgrades, skillUpgrades: {}, skillTiers: {} },
     upgradeEffects
   );
 
   const baseRegen = computeRegen(
-    { skills, prestigeUpgrades, skillUpgrades, skillTiers },
+    { skills: {}, prestigeUpgrades, skillUpgrades: {}, skillTiers: {} },
     upgradeEffects
   );
 
   const clickMana = computeClickMana({
-    skills,
-    prestigeUpgrades,
-    skillUpgrades,
-    skillTiers,
+    skills: {},
   });
 
-  const meditationMultiplier = getMeditationBonus(meditateTicks, skills, upgradeEffects.meditationEfficiency);
+  const meditationMultiplier = getMeditationBonus(meditateTicks, {}, upgradeEffects.meditationEfficiency);
   const incursionStrength = getIncursionStrength(day, hour);
   const effectiveRegenWithSpecials = baseRegen * (1 - incursionStrength);
 
@@ -115,22 +106,18 @@ export function useManaStats() {
  * Get combat-related derived state
  */
 export function useCombatStats() {
-  const skills = useSkillStore((s) => s.skills);
   const signedPacts = usePrestigeStore((s) => s.signedPacts);
   const equippedInstances = useCraftingStore((s) => s.equippedInstances);
   const equipmentInstances = useCraftingStore((s) => s.equipmentInstances);
-  const skillUpgrades = useSkillStore((s) => s.skillUpgrades);
-  const skillTiers = useSkillStore((s) => s.skillTiers);
 
   const upgradeEffects = getUnifiedEffects({
-    skillUpgrades,
-    skillTiers,
+    skillUpgrades: {},
+    skillTiers: {},
     equippedInstances,
     equipmentInstances,
   });
 
   return {
-    skills,
     signedPacts,
     equippedInstances,
     equipmentInstances,