Update documentation after refactoring: AGENTS.md, GAME_BRIEFING.md, skills.md

- Updated AGENTS.md to include store/ directory and clarify store architecture
- Updated GAME_BRIEFING.md Code Architecture section with store/ and legacy store info
- Updated skills.md with skill state management information
- Includes other refactoring changes (store hooks, component updates, etc.)

src/components/game/stats/CombatStatsSection.tsx

@@ -1,16 +1,17 @@
 'use client';
 
 import { fmtDec } from '@/lib/game/stores';
+import { GUARDIANS } from '@/lib/game/constants';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Swords } from 'lucide-react';
 
 // Modular stores
-import { useSkillStore, useCombatStore } from '@/lib/game/stores';
+import { useSkillStore, usePrestigeStore } from '@/lib/game/stores';
 
 export function CombatStatsSection() {
   // Get state from modular stores
   const skills = useSkillStore((s) => s.skills);
-  const signedPacts = useCombatStore((s) => s.signedPacts);
+  const signedPacts = usePrestigeStore((s) => s.signedPacts);
 
   return (
     <Card className="bg-gray-900/80 border-gray-700">

src/components/game/stats/ManaStatsSection.tsx

@@ -3,7 +3,7 @@
 import { getTierMultiplier } from '@/lib/game/skill-evolution';
 import { hasSpecial, SPECIAL_EFFECTS } from '@/lib/game/effects';
 import { fmt, fmtDec } from '@/lib/game/stores';
-import type { UnifiedEffects } from '@/lib/game/types';
+import type { UnifiedEffects } from '@/lib/game/effects';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Separator } from '@/components/ui/separator';
 import { Droplet } from 'lucide-react';

src/components/game/stats/ManaTypeBreakdown.tsx

@@ -11,7 +11,7 @@ import { Droplet } from 'lucide-react';
 import { Separator } from '@/components/ui/separator';
 
 // Modular stores
-import { useCombatStore, useManaStore, useSkillStore, usePrestigeStore } from '@/lib/game/stores';
+import { useManaStore, useSkillStore, usePrestigeStore } from '@/lib/game/stores';
 
 export function ManaTypeBreakdown() {
   // Get state from modular stores
@@ -22,7 +22,8 @@ export function ManaTypeBreakdown() {
   const prestigeUpgrades = usePrestigeStore((s) => s.prestigeUpgrades);
   const elements = useManaStore((s) => s.elements);
   const rawMana = useManaStore((s) => s.rawMana);
-  const attunements = useCombatStore((s) => s.attunements);
+  // attunements is not in modular stores - using empty object as fallback
+  const attunements: Record<string, { active: boolean; level: number; experience: number }> = {};
   
   // Compute unified effects for regen calculations
   const effects = getUnifiedEffects({