feat(FN-3159): move roadmap ownership from core to fusion-plugin-roadmap pl

Moves roadmap ownership from `@fusion/core` to `fusion-plugin-roadmap`, deleting ~1,800 lines of roadmap store, types, ordering, and handoff logic from core and replacing it with ~760 lines of new route handlers in the plugin. The dashboard's roadmap routes and suggestions modules are substantially

Fusion-Task-Id: FN-3159

packages/dashboard/src/routes/register-integrated-routers.ts

@@ -2,11 +2,11 @@ import type { Router } from "express";
 import type { TaskStore } from "@fusion/core";
 import type { ServerOptions } from "../server.js";
 import { createMissionRouter } from "../mission-routes.js";
-import { createRoadmapRouter } from "../roadmap-routes.js";
 import { createInsightsRouter } from "../insights-routes.js";
 import { createEvalsRouter } from "../evals-routes.js";
 import { createResearchRouter } from "../research-routes.js";
 import { createTodoRouter } from "../todo-routes.js";
+import { createRoadmapRouter } from "../roadmap-routes.js";
 import { createDevServerRouter } from "../dev-server-routes.js";
 import type { AiSessionStore } from "../ai-session-store.js";
 
@@ -33,11 +33,11 @@ export function registerIntegratedRouters({
     createMissionRouter(store, options?.missionAutopilot, aiSessionStore, options?.missionExecutionLoop, options?.engineManager),
   );
 
-  router.use("/roadmaps", createRoadmapRouter(store));
   router.use("/insights", createInsightsRouter(store));
   router.use("/evals", createEvalsRouter(store));
   router.use("/research", createResearchRouter(store));
   router.use("/todos", createTodoRouter(store));
+  router.use("/roadmaps", createRoadmapRouter(store));
 }
 
 export function registerIntegratedDevServerRouter({ router, store }: DevServerRouterOptions): void {