Initial commit for finalisation web interface

copienator/commands/clean.py

@@ -155,6 +155,9 @@ def build_cleanup_plan(workspace: EvaluationWorkspace) -> CleanupPlan:
 
     kept_files = set(processed_copies)
     kept_files.add(workspace.correction_file)
+    lock_file = workspace.root / ".copienator-finalisation.lock"
+    if lock_file in files:
+        kept_files.add(lock_file)
     kept_files.update(_return_artifacts(workspace))
     kept_files.update(
         path