feat(daemon+store+api): verdict硬闸+执行期锁+conflict优先+schema

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/api/server.ts

@@ -204,6 +204,9 @@ export function buildServer(opts: ApiOptions): FastifyInstance {
   // 部分更新任务（title/priority/complexity；complexity 重置逻辑在 Store.patchTask）
   app.patch('/api/tasks/:id', (req) => {
     const { id } = req.params as { id: string };
+    if (store.hasInflightRun(id)) {
+      throw new StoreError('任务有在途 run，执行期间禁止修改');
+    }
     const b = (req.body ?? {}) as Record<string, unknown>;
     const patch: PatchTaskInput = {};
     if (b.title !== undefined) patch.title = String(b.title);