feat(FN-3899): add chat rooms with send routing and delete-room UI

This merge delivers chat rooms with room send routing and delete-room UI in the dashboard (FN-3899), including fixes for bundled plugin view imports and a release changeset. Supporting changes include a merger improvement that tightens scope-warning diff base when baseBranch is missing, companies.sh

Fusion-Task-Id: FN-3899

packages/dashboard/app/plugins/registerBundledPluginViews.ts

@@ -1,8 +1,29 @@
 import { lazy } from "react";
+import type { ComponentType } from "react";
 import { registerPluginView } from "./pluginViewRegistry";
 
 let registered = false;
 
+function createMissingPluginView(moduleId: string): ComponentType {
+  return function MissingPluginView() {
+    return `Bundled plugin view unavailable: ${moduleId}`;
+  };
+}
+
+async function loadBundledPluginView(moduleId: string, exportName: string) {
+  try {
+    const mod = await import(/* @vite-ignore */ moduleId) as Record<string, ComponentType>;
+    const component = mod[exportName];
+    if (component) {
+      return { default: component };
+    }
+  } catch {
+    // Fall back to placeholder view when optional bundled plugin examples are unavailable.
+  }
+
+  return { default: createMissingPluginView(moduleId) };
+}
+
 export function registerBundledPluginViews(): void {
   if (registered) return;
   registered = true;
@@ -10,18 +31,12 @@ export function registerBundledPluginViews(): void {
   registerPluginView(
     "fusion-plugin-dependency-graph",
     "graph",
-    lazy(async () => {
-      const mod = await import("@fusion-plugin-examples/dependency-graph/dashboard-view");
-      return { default: mod.DependencyGraphDashboardView };
-    }),
+    lazy(() => loadBundledPluginView("@fusion-plugin-examples/dependency-graph/dashboard-view", "DependencyGraphDashboardView")),
   );
 
   registerPluginView(
     "roadmap-planner",
     "roadmaps",
-    lazy(async () => {
-      const mod = await import("@fusion-plugin-examples/roadmap/dashboard-view");
-      return { default: mod.RoadmapDashboardView };
-    }),
+    lazy(() => loadBundledPluginView("@fusion-plugin-examples/roadmap/dashboard-view", "RoadmapDashboardView")),
   );
 }