feat: push DAG on save and commit

Adds _push_dag_after_upload() helper that extracts the feature DAG
and pushes it to Silo after a successful file upload.

Hooked into both Silo_Save and Silo_Commit commands. DAG sync
failures are logged as warnings and never block the save/commit.

Closes kindred/create#216

freecad/silo_commands.py

@@ -717,6 +717,28 @@ class Silo_New:
         return _server_mode == "normal"
 
 
+def _push_dag_after_upload(doc, part_number, revision_number):
+    """Extract and push the feature DAG after a successful upload.
+
+    Failures are logged as warnings -- DAG sync must never block save.
+    """
+    try:
+        from dag import extract_dag
+
+        nodes, edges = extract_dag(doc)
+        if not nodes:
+            return
+
+        result = _client.push_dag(part_number, revision_number, nodes, edges)
+        node_count = result.get("node_count", len(nodes))
+        edge_count = result.get("edge_count", len(edges))
+        FreeCAD.Console.PrintMessage(
+            f"DAG synced: {node_count} nodes, {edge_count} edges\n"
+        )
+    except Exception as e:
+        FreeCAD.Console.PrintWarning(f"DAG sync failed: {e}\n")
+
+
 class Silo_Save:
     """Save locally and upload to MinIO."""
 
@@ -787,6 +809,8 @@ class Silo_Save:
             new_rev = result["revision_number"]
             FreeCAD.Console.PrintMessage(f"Uploaded as revision {new_rev}\n")
 
+            _push_dag_after_upload(doc, part_number, new_rev)
+
         except Exception as e:
             FreeCAD.Console.PrintWarning(f"Upload failed: {e}\n")
             FreeCAD.Console.PrintMessage("File saved locally but not uploaded.\n")
@@ -841,6 +865,8 @@ class Silo_Commit:
             new_rev = result["revision_number"]
             FreeCAD.Console.PrintMessage(f"Committed revision {new_rev}: {comment}\n")
 
+            _push_dag_after_upload(doc, part_number, new_rev)
+
         except Exception as e:
             FreeCAD.Console.PrintError(f"Commit failed: {e}\n")