Keep YuE2 jobs live on the bench and wire target length to semantic tokens.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/yue2.ts

@@ -11,6 +11,11 @@ function settings() {
     token: String(config.comfyControlToken || process.env.COMFY_CONTROL_TOKEN || '') }
 }
 export function yue2Configured() { return Boolean(settings().url) }
+function pendingRoot() { return join(String(useRuntimeConfig().libraryDir || process.env.LIBRARY_DIR || '/data/library'), 'yue2-pending') }
+export function yue2PendingAlive(jobId: string) {
+  if (!jobId) return false
+  return existsSync(join(pendingRoot(), `${jobId}.json`))
+}
 async function request(path: string, body?: unknown) {
   const { url, token } = settings()
   if (!url) throw new Error('YuE2 host is not configured. Set COMFY_CONTROL_URL.')
@@ -26,7 +31,6 @@ async function request(path: string, body?: unknown) {
   }
   return response
 }
-function pendingRoot() { return join(String(useRuntimeConfig().libraryDir || process.env.LIBRARY_DIR || '/data/library'), 'yue2-pending') }
 function persist(job: Job) {
   mkdirSync(pendingRoot(), { recursive: true })
   const path = join(pendingRoot(), `${job.id}.json`)