Lock PersonCardReader to a single public Read.

Phase 58 promised no second public card API; reflection now fails if another method appears.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.Server.Tests/PersonCardReaderShapeTests.cs

@@ -0,0 +1,29 @@
+using System.Reflection;
+using HSchool.Server.Game;
+using HSchool.Simulation;
+
+namespace HSchool.Server.Tests;
+
+public class PersonCardReaderShapeTests
+{
+    [Fact]
+    public void PersonCardReader_HasOnePublicRead()
+    {
+        var reader = typeof(PersonCardReader);
+        Assert.True(reader.IsAbstract && reader.IsSealed);
+        Assert.False(reader.IsPublic);
+
+        var publicMethods = reader.GetMethods(
+                BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static | BindingFlags.DeclaredOnly)
+            .Where(method => !method.IsSpecialName)
+            .ToArray();
+        var read = Assert.Single(publicMethods);
+        Assert.Equal("Read", read.Name);
+
+        var parameters = read.GetParameters();
+        Assert.Equal(3, parameters.Length);
+        Assert.Equal(typeof(School), parameters[0].ParameterType);
+        Assert.Equal(typeof(string), parameters[1].ParameterType);
+        Assert.Equal(typeof(string), parameters[2].ParameterType);
+    }
+}