boot: cpu-only warmup; decorated gpu_warmup pass

app.py

@@ -75,10 +75,10 @@ def gpu_call(fn, *args):
     return out
 
 
-D.warmup()  # CPU: weights built + kernels hot at boot
+D.warmup()  # CPU at boot: weights built; NO cuda touch outside a decorated call
 if ZERO:
     try:
-        gpu_call(D.warmup)   # first ZeroGPU attach: real-GPU warm move while the UI is still closed
+        gpu_call(D.warmup, True)   # decorated attach: real-GPU warm move while the UI is still closed
     except Exception as e:
         print("ZeroGPU warm-up skipped:", type(e).__name__, e, flush=True)
 MODEL_KEYS = list(D.MODEL_REPOS)