feat(HAI-002): add scheduler config endpoint to dashboard API

packages/dashboard/app/api.ts

@@ -39,3 +39,7 @@ export function deleteTask(id: string): Promise<Task> {
 export function mergeTask(id: string): Promise<MergeResult> {
   return api<MergeResult>(`/tasks/${id}/merge`, { method: "POST" });
 }
+
+export function fetchConfig(): Promise<{ maxConcurrent: number }> {
+  return api<{ maxConcurrent: number }>("/config");
+}

packages/dashboard/src/routes.ts

@@ -6,6 +6,11 @@ import type { ServerOptions } from "./server.js";
 export function createApiRoutes(store: TaskStore, options?: ServerOptions): Router {
   const router = Router();
 
+  // Scheduler config
+  router.get("/config", (_req, res) => {
+    res.json({ maxConcurrent: options?.maxConcurrent ?? 2 });
+  });
+
   // List all tasks
   router.get("/tasks", async (_req, res) => {
     try {

packages/dashboard/src/server.ts

@@ -11,6 +11,8 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 export interface ServerOptions {
   /** Custom merge handler — when provided, used instead of store.mergeTask */
   onMerge?: (taskId: string) => Promise<MergeResult>;
+  /** Maximum concurrent worktrees / execution slots (default 2) */
+  maxConcurrent?: number;
 }
 
 export function createServer(store: TaskStore, options?: ServerOptions): ReturnType<typeof express> {