Refuse to start Comfy while AITraining has the GPU.

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

server/utils/comfyLifecycle.ts

@@ -109,6 +109,8 @@ async function controlRequest(path: string, method = 'GET', timeoutMs = 5000) {
       stopped?: boolean
       killed?: unknown
       error?: string
+      message?: string
+      training?: { busy?: boolean; jobId?: string | null; status?: string | null; name?: string | null; message?: string }
       running?: number
       pending?: number
       status?: number
@@ -118,6 +120,8 @@ async function controlRequest(path: string, method = 'GET', timeoutMs = 5000) {
         ok: false as const,
         status: res.status,
         error: body?.error,
+        message: body?.message,
+        training: body?.training,
         running: body?.running,
         pending: body?.pending,
         killed: body?.killed
@@ -133,6 +137,15 @@ export async function fetchComfyControlStatus() {
   return await controlRequest('/status')
 }
 
+function throwIfTrainingBusy(remote: { training?: { busy?: boolean; message?: string }; error?: string; message?: string } | null) {
+  const busy = Boolean(remote?.training?.busy || remote?.error === 'train-busy')
+  if (!busy) return
+  throw createError({
+    statusCode: 409,
+    statusMessage: remote?.training?.message || remote?.message || 'AITraining is using the GPU. Stop that job before poking Comfy.'
+  })
+}
+
 export async function requestComfyWake() {
   const { controlUrl } = settings()
   if (!controlUrl) {
@@ -148,10 +161,11 @@ export async function requestComfyWake() {
       statusMessage: 'Beast host agent is unreachable. Confirm it is running on the desktop.'
     })
   }
+  throwIfTrainingBusy(remote)
   if (remote.ok === false) {
     throw createError({
       statusCode: Number(remote.status) || 502,
-      statusMessage: 'Beast host agent refused to start Comfy.'
+      statusMessage: String(remote.message || remote.error || 'Beast host agent refused to start Comfy.')
     })
   }
   return {
@@ -250,6 +264,7 @@ async function startComfy() {
   lastStartAt = now
 
   const remote = await controlRequest('/start', 'POST')
+  throwIfTrainingBusy(remote)
   if (remote?.ok || remote?.started) {
     log('start-remote', { pid: remote.pid || null })
     return { started: true, reason: 'remote' as const }
@@ -322,6 +337,8 @@ function hostWithPort(host: string, port: number) {
 async function ensureUnlocked(onStatus: StatusFn, skipBusyWait = false) {
   const cfg = settings()
   const host = cfg.host
+  const lock = await controlRequest('/status')
+  throwIfTrainingBusy(lock)
   onStatus({ state: 'offline', message: 'Checking ComfyUI...', host })
 
   const health = await checkComfyHttp(cfg.healthTimeoutMs)