Test writing context follow contract

PlotLine.Tests/Program.cs

@@ -73,7 +73,10 @@ var tests = new (string Name, Action Test)[]
     ("Illustration evidence trace does not recursively store previous evidence", IllustrationEvidenceTraceDoesNotRecursivelyStorePreviousEvidence),
     ("StoryPosition rejects incomplete or invalid runtime scene positions", StoryPositionRejectsInvalidRuntimeScenePositions),
     ("StoryPosition builds canonical runtime scene navigation", StoryPositionBuildsCanonicalRuntimeSceneNavigation),
-    ("StoryPosition derives canonical scene context identity", StoryPositionDerivesCanonicalSceneContextIdentity)
+    ("StoryPosition derives canonical scene context identity", StoryPositionDerivesCanonicalSceneContextIdentity),
+    ("Writing Context route uses canonical story context service", WritingContextRouteUsesCanonicalStoryContextService),
+    ("Writing Context client follows canonical story position events", WritingContextClientFollowsCanonicalStoryPositionEvents),
+    ("Writing Context preserves selected tab and avoids event loops", WritingContextPreservesSelectedTabAndAvoidsEventLoops)
 };
 
 foreach (var test in tests)
@@ -136,6 +139,47 @@ static void StoryPositionDerivesCanonicalSceneContextIdentity()
     Assert(position!.ProjectId == 4 && position.BookId == 5 && position.ChapterId == 6 && position.SceneId == 7, "Scene workspace position IDs were not preserved.");
 }
 
+static void WritingContextRouteUsesCanonicalStoryContextService()
+{
+    var root = Path.Combine(AppContext.BaseDirectory, "../../../../PlotLine");
+    var controller = File.ReadAllText(Path.Combine(root, "Controllers/WritingController.cs"));
+    var viewModel = File.ReadAllText(Path.Combine(root, "ViewModels/CoreViewModels.cs"));
+
+    Assert(controller.Contains("[Route(\"Writing\")", StringComparison.Ordinal), "Writing Context controller should expose the /Writing route prefix.");
+    Assert(controller.Contains("[HttpGet(\"Context\")", StringComparison.Ordinal), "Writing Context shell route is missing.");
+    Assert(controller.Contains("[HttpGet(\"Context/Scene\")", StringComparison.Ordinal), "Writing Context partial route is missing.");
+    Assert(controller.Contains("IStoryContextService storyContext", StringComparison.Ordinal), "Writing Context must consume IStoryContextService.");
+    Assert(controller.Contains("storyContext.GetForSceneAsync", StringComparison.Ordinal), "Writing Context scene requests must load canonical story context.");
+    Assert(!controller.Contains("ISceneService", StringComparison.Ordinal), "Writing Context should not bypass canonical story context with ISceneService.");
+    Assert(viewModel.Contains("StoryContextViewModel? Context", StringComparison.Ordinal), "Writing Context display model should carry canonical story context.");
+}
+
+static void WritingContextClientFollowsCanonicalStoryPositionEvents()
+{
+    var root = Path.Combine(AppContext.BaseDirectory, "../../../../PlotLine");
+    var script = File.ReadAllText(Path.Combine(root, "wwwroot/js/writing-context.js"));
+    var view = File.ReadAllText(Path.Combine(root, "Views/Writing/Context.cshtml"));
+
+    Assert(view.Contains("data-writing-context", StringComparison.Ordinal), "Writing Context shell should expose a stable script root.");
+    Assert(script.Contains("window.PlotDirectorStoryPosition?.eventName", StringComparison.Ordinal), "Writing Context must subscribe to canonical browser story-position events.");
+    Assert(script.Contains("connection.on(\"storyPositionChanged\"", StringComparison.Ordinal), "Writing Context must bridge SignalR story-position events.");
+    Assert(script.Contains("fetch(url", StringComparison.Ordinal), "Writing Context should refresh context content without full page navigation.");
+    Assert(script.Contains("data-writing-context-scene-select", StringComparison.Ordinal), "Writing Context manual fallback selector should be wired.");
+    Assert(script.Contains("publishChanged", StringComparison.Ordinal), "Manual scene selection should publish canonical story-position changes.");
+}
+
+static void WritingContextPreservesSelectedTabAndAvoidsEventLoops()
+{
+    var root = Path.Combine(AppContext.BaseDirectory, "../../../../PlotLine");
+    var script = File.ReadAllText(Path.Combine(root, "wwwroot/js/writing-context.js"));
+
+    Assert(script.Contains("plotdirector.writingContext.activeTab", StringComparison.Ordinal), "Writing Context should remember the selected tab.");
+    Assert(script.Contains("activateTab(tab)", StringComparison.Ordinal), "Writing Context should restore the selected tab after content refresh.");
+    Assert(script.Contains("position.sceneId === currentSceneId", StringComparison.Ordinal), "Writing Context should ignore duplicate current-scene events.");
+    Assert(script.Contains("position.sceneId === loadingSceneId", StringComparison.Ordinal), "Writing Context should ignore duplicate in-flight scene events.");
+    Assert(!script.Contains("window.location.assign", StringComparison.Ordinal) && !script.Contains("window.location.href", StringComparison.Ordinal), "Writing Context must not navigate away when Word changes scene.");
+}
+
 static void StripsMarkdownFence()
 {
     var result = StoryIntelligenceJsonRepair.Repair("""