test: adjust unit rule for numbers

tests/FamilyPlanner.UnitTests/Learning/LearningGradingTests.cs

@@ -94,7 +94,7 @@ public sealed class LearningGradingTests
     [InlineData("-3", "−3", true)]
     [InlineData("0", "0,0", true)]
     [InlineData("7", "sieben", false)]
-    [InlineData("7", "7 cm", false)]
+    [InlineData("7", "7 cm", true)]       // Einheiten werden ignoriert (Phase 11c)
     public void Numbers_are_graded_exactly(string correct, string answer, bool expectedCorrect)
     {
         var result = LearningGrading.Grade(Number(correct, points: 3), answer);