feat: Add -5 points penalty for track extension on wrong guesses

- Add -5 points penalty for track extension (unlock steps) on wrong guesses
- Wrong guess now costs -8 points total (-3 for wrong + -5 for extension)
- Skip remains at -5 points (no additional penalty)
- Update documentation (README.md, SCORING_OPTIONS.md)
- Add SCORING_OPTIONS.md with detailed scoring system analysis

lib/gameState.ts

@@ -200,6 +200,9 @@ export function useGameState(
             } else {
                 newScore -= 3;
                 newBreakdown.push({ value: -3, reason: 'Wrong guess' });
+                // Additional penalty for track extension (unlock steps)
+                newScore -= 5;
+                newBreakdown.push({ value: -5, reason: 'Track extension' });
             }
         }