add shel

src/HSchool.Content/PeopleDefValidator.cs

@@ -29,6 +29,11 @@ internal static class PeopleDefValidator
             ValidateNameSet(names);
         }
 
+        foreach (var subject in catalog.Subjects.Values)
+        {
+            ValidateSubject(subject, catalog);
+        }
+
         RequireBuildInputs(catalog);
     }
 
@@ -218,6 +223,43 @@ internal static class PeopleDefValidator
         }
     }
 
+    private static void ValidateSubject(SubjectDef subject, DefCatalog catalog)
+    {
+        if (subject.HoursPerWeek < 0)
+        {
+            throw new ContentLoadException($"SubjectDef '{subject.DefName}' hoursPerWeek cannot be negative.");
+        }
+
+        if (subject.Grades.Min < 1 || subject.Grades.Max > 11 || subject.Grades.Min > subject.Grades.Max)
+        {
+            throw new ContentLoadException($"SubjectDef '{subject.DefName}' grades must be 1–11 with min ≤ max.");
+        }
+
+        if (subject.Skills.Count == 0)
+        {
+            throw new ContentLoadException($"SubjectDef '{subject.DefName}' needs at least one skill.");
+        }
+
+        var seen = new HashSet<string>(StringComparer.Ordinal);
+        foreach (var share in subject.Skills)
+        {
+            if (string.IsNullOrWhiteSpace(share.Skill) || !seen.Add(share.Skill))
+            {
+                throw new ContentLoadException($"SubjectDef '{subject.DefName}' has a missing or duplicate skill.");
+            }
+
+            if (!catalog.Skills.TryGetValue(share.Skill, out var skill) || skill.Abstract)
+            {
+                throw new ContentLoadException($"SubjectDef '{subject.DefName}' references unknown SkillDef '{share.Skill}'.");
+            }
+
+            if (share.Share < 0)
+            {
+                throw new ContentLoadException($"SubjectDef '{subject.DefName}' skill '{share.Skill}' share cannot be negative.");
+            }
+        }
+    }
+
     private static void ValidateNameSet(NameSetDef names)
     {
         if (!NameGrammar.IsKnownPatronymic(names.PatronymicRule))