Restore automatic weight adjustment only when weight is not explicitly set

- If --weight is not specified, master weight changes to 0 when clients connect
- If --weight is specified, master participates in job selection with that weight

vidai/cluster_master.py

@@ -311,9 +311,12 @@ class ClusterMaster:
             'failing': False  # Mark as failing after 3 consecutive failures
         }
 
-        # Update connected clients count
+        # If this is the first client and weight wasn't explicitly set, change master weight to 0
         from .database import get_connected_cluster_clients
         connected_clients = get_connected_cluster_clients()
+        if len(connected_clients) == 1 and self.weight == 100 and not self.weight_explicit:
+            self.weight = 0
+            print("First client connected - changing master weight to 0 (automatic)")
 
         backend_type = "GPU" if has_gpu else "CPU-only"
         print(f"Client {client_id} authenticated ({backend_type}) with backends: {available_backends}")
@@ -396,7 +399,10 @@ class ClusterMaster:
             for proc_type, queue in self.process_queue.items():
                 self.process_queue[proc_type] = [(k, w) for k, w in queue if k != proc_key]
 
-        # Update client count
+        # If no clients remain and weight wasn't explicitly set, change master weight back to 100
+        if len(self.clients) == 0 and self.weight == 0 and not self.weight_explicit:
+            self.weight = 100
+            print("All clients disconnected - changing master weight back to 100 (automatic)")
 
         print(f"Client {client_id} disconnected")