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.)

.husky/scripts/generate-project-tree.js

@@ -1,6 +1,6 @@
 const fs = require('fs');
 const path = require('path');
-const { execSync } = require('child_process');
+const { execSync } = require('node:child_process');
 
 // Directory to start from (project root)
 const ROOT_DIR = process.cwd();