fc5: export script — add --output FILE flag for Swarm one-shot service use

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/export_for_fabledcurator.py

@@ -114,6 +114,16 @@ def _export_series_pages():
 
 
 def main() -> None:
+    import argparse
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--output",
+        default=None,
+        help="Write JSON to this path instead of stdout (use this when "
+             "running inside a Swarm service that writes to a bind-mount).",
+    )
+    args = parser.parse_args()
+
     app = create_app()
     with app.app_context():
         export = {
@@ -125,6 +135,16 @@ def main() -> None:
             "image_tag_associations": _export_image_tag_associations(),
             "series_pages": _export_series_pages(),
         }
+
+    if args.output:
+        from pathlib import Path
+        out_path = Path(args.output)
+        out_path.parent.mkdir(parents=True, exist_ok=True)
+        out_path.write_text(json.dumps(export, indent=2) + "\n")
+        print(f"wrote {out_path} ({len(export['tags'])} tags, "
+              f"{len(export['image_tag_associations'])} associations)",
+              file=sys.stderr)
+    else:
         json.dump(export, sys.stdout, indent=2)
         sys.stdout.write("\n")