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.)

docs/GAME_BRIEFING.md

@@ -1083,7 +1083,9 @@ dps = (damage × castSpeed × attackSpeedMultiplier) / hour
 
 The codebase has been refactored into a modular architecture for better maintainability:
 
-#### Store Architecture (`src/lib/game/stores/`)
+#### Store Architecture
+
+**New Modular Stores (`src/lib/game/stores/`):**
 - **gameStore.ts**: Core state, tick logic, and main actions
 - **manaStore.ts**: Mana gathering, elements, conversion
 - **combatStore.ts**: Combat system, spells, floor progression
@@ -1091,6 +1093,14 @@ The codebase has been refactored into a modular architecture for better maintain
 - **skillStore.ts**: Skill state, studying, evolution
 - **uiStore.ts**: UI state, modals, debug settings
 
+**Legacy Store (Migration in Progress):**
+- **store.ts**: Legacy monolithic store (reduced from ~2812 lines to ~14KB)
+- **store/**: Legacy store slices being migrated to `stores/`
+  - `combatSlice.ts`, `manaSlice.ts`, `skillSlice.ts`, etc.
+  - `computed.ts`: Computed stats utilities
+- **store-modules/**: Legacy store utilities
+  - `computed-stats.ts`, `initial-state.ts`, `tick-logic.ts`, etc.
+
 #### Crafting System (`src/lib/game/crafting-actions/`)
 - Modular action files for each crafting stage
 - Design, preparation, application, equipment, disenchant actions

docs/project-structure.txt

@@ -481,6 +481,7 @@ Mana-Loop/
 ├── Dockerfile
 ├── README.md
 ├── bun.lock
+├── bunfig.toml
 ├── components.json
 ├── docker-compose.yml
 ├── eslint.config.mjs

docs/skills.md

@@ -665,6 +665,12 @@ Each skill tree has its own module:
 | `types.ts` | TypeScript interfaces |
 | `index.ts` | Main export combining all modules (~11KB) |
 
+#### Skill State Management
+Skill state is managed in the store layer:
+- **New Modular Store:** `src/lib/game/stores/skillStore.ts` (~11KB) - Active skill state, studying, evolution
+- **Legacy Slice:** `src/lib/game/store/skillSlice.ts` - Being migrated to `skillStore.ts`
+- **Skill state includes:** `skills` (levels), `skillUpgrades` (chosen upgrades), `skillTiers` (current tier)
+
 ### Adding a New Skill (Updated Process)
 
 1. **Define in `constants/skills.ts`** (NEW location)