Tighten layer graph tests and document npm test typecheck.

Content and People/Schedule/Ai now fail the same way if they grow a game-layer edge the projects.md graph forbids; README matches the tsc-then-vitest script from phase 57.

README.md

@@ -107,7 +107,8 @@ dotnet test
 npm --prefix src/HSchool.Client test
 ```
 
-Vitest covers the client codec, the calendar formatting and the RU/EN dictionaries.
+`npm test` runs `tsc -b` then Vitest (codec, calendar formatting, RU/EN dictionaries). A duplicate
+key in `strings.ts` fails typecheck without `npm run build`. `test:watch` is Vitest only.
 
 ## Layout
 

src/HSchool.Client/scripts/npm-test.test.ts

@@ -33,6 +33,10 @@ describe('npm test script', () => {
   it('does not depend on the hschool-client file: loop', () => {
     expect(pkg.dependencies?.['hschool-client']).toBeUndefined();
   });
+
+  it('keeps build as typecheck then vite, without the file: loop', () => {
+    expect(pkg.scripts.build).toBe('tsc -b && vite build');
+  });
 });
 
 describe('duplicate dictionary keys', () => {

tests/HSchool.Architecture.Tests/LayerBoundaryTests.cs

@@ -40,11 +40,14 @@ public class LayerBoundaryTests
     }
 
     [Fact]
-    public void Content_DoesNotReferenceArchAspNetSocketsProtocolOrSimulation()
+    public void Content_DoesNotReferenceArchAspNetSocketsProtocolPeopleScheduleAiOrSimulation()
     {
         var names = References(typeof(MapLayout));
         AssertNoArchAspNetOrSockets(names);
         Assert.DoesNotContain("HSchool.Protocol", names, StringComparer.Ordinal);
+        Assert.DoesNotContain("HSchool.People", names, StringComparer.Ordinal);
+        Assert.DoesNotContain("HSchool.Schedule", names, StringComparer.Ordinal);
+        Assert.DoesNotContain("HSchool.Ai", names, StringComparer.Ordinal);
         Assert.DoesNotContain("HSchool.Simulation", names, StringComparer.Ordinal);
     }
 
@@ -54,7 +57,10 @@ public class LayerBoundaryTests
     [InlineData(typeof(WalkGraph))]
     public void PeopleScheduleAi_DoNotReferenceArchAspNetOrSockets(Type marker)
     {
-        AssertNoArchAspNetOrSockets(References(marker));
+        var names = References(marker);
+        AssertNoArchAspNetOrSockets(names);
+        Assert.DoesNotContain("HSchool.Protocol", names, StringComparer.Ordinal);
+        Assert.DoesNotContain("HSchool.Simulation", names, StringComparer.Ordinal);
     }
 
     [Fact]
@@ -83,6 +89,16 @@ public class LayerBoundaryTests
         }
     }
 
+    [Fact]
+    public void ArchitectureTests_DoNotReferenceHostOrNetArchTest()
+    {
+        var csproj = File.ReadAllText(
+            Path.Combine(RepoRoot(), "tests", "HSchool.Architecture.Tests", "HSchool.Architecture.Tests.csproj"));
+        Assert.DoesNotContain("HSchool.Server", csproj, StringComparison.Ordinal);
+        Assert.DoesNotContain("HSchool.AppHost", csproj, StringComparison.Ordinal);
+        Assert.DoesNotContain("NetArchTest", csproj, StringComparison.OrdinalIgnoreCase);
+    }
+
     [Fact]
     public void PeopleAiScheduleSimulationTests_NoLongerCarryLayerBans()
     {