Fixes the configuration file

app/Http/Controllers/ScreeningController.php

@@ -103,15 +103,17 @@ private function calculateAndUpdateScore(Screening $screening, array $answers):
     }
 
     /**
-     * Calculate the total score from the answers.
+     * Calculate the total score from the answers — yes = 1, unknown = 0.5, no = 0.
      */
-    private function calculateScore(array $answers): int
+    private function calculateScore(array $answers): float
     {
         $score = 0;
 
         foreach ($answers as $value) {
             if ($value === 'yes') {
                 $score++;
+            } elseif ($value === 'unknown') {
+                $score += 0.5;
             }
         }
 

app/Http/Requests/Screening/UpdateScreeningRequest.php

@@ -25,7 +25,7 @@ public function rules(): array
     {
         return [
             'answers' => ['required', 'array', 'size:10'],
-            'answers.*' => ['required', 'string', 'in:yes,no'],
+            'answers.*' => ['required', 'string', 'in:yes,unknown,no'],
         ];
     }
 
@@ -40,7 +40,7 @@ public function messages(): array
             'answers.size' => 'All 10 screening questions must be answered.',
             'answers.*.required' => 'Each screening question must have an answer.',
             'answers.*.string' => 'Each answer must be a valid text value.',
-            'answers.*.in' => 'Each answer must be either "yes" or "no".',
+            'answers.*.in' => 'Each answer must be "yes", "I don\'t know", or "no".',
         ];
     }
 }