workshop rework

Content/Python/ue_workshop/progress.py

@@ -0,0 +1,16 @@
+"""Small append-only progress events shared with the external launcher."""
+import json
+import os
+from pathlib import Path
+
+
+def report(state, **details):
+    target = os.environ.get("WORKSHOP_PROGRESS")
+    if not target:
+        return
+    try:
+        with Path(target).open("a", encoding="utf-8") as stream:
+            stream.write(json.dumps(dict(state=state, **details), ensure_ascii=False) + "\n")
+    except OSError:
+        # Progress reporting must not interrupt a render or hide its result.
+        pass