TypeScript Strict Mode Enforcer

Ensure strict TypeScript practices and type safety across the Tetris codebase.

Core Principles

1. No any Types: Use unknown and type guards instead
2. No Type Assertions: Use type guards and narrowing
3. No Non-null Assertions (!): Use optional chaining and type guards
4. Result<T, E> Pattern: For game logic error handling
5. Exhaustive Type Checking: Handle all union type cases

Type Safety Patterns

1. Replace any with unknown