fix(manifests): clean stale .!dev resume markers before merge

HLS/DASH/ISM iterdir included leftover .!dev control files from aborted runs, crashing HLS merge_discontinuity and silently corrupting DASH/ISM merged output.

unshackle/core/manifests/dash.py

@@ -489,6 +489,9 @@ class DASH:
                 )
             raise FileNotFoundError(error_msg)
 
+        for control_file in save_dir.glob("*.!dev"):
+            control_file.unlink(missing_ok=True)
+
         segments_to_merge = [x for x in sorted(save_dir.iterdir()) if x.is_file()]
 
         if debug_logger:

unshackle/core/manifests/hls.py

@@ -655,9 +655,8 @@ class HLS:
                     status_update["downloaded"] = f"HLS {downloaded}"
                 progress(**status_update)
 
-        # see https://github.com/devine-dl/devine/issues/71
-        for control_file in segment_save_dir.glob("*.aria2__temp"):
-            control_file.unlink()
+        for control_file in segment_save_dir.glob("*.!dev"):
+            control_file.unlink(missing_ok=True)
 
         progress(total=total_segments, completed=0, downloaded="Merging")
 

unshackle/core/manifests/ism.py

@@ -325,6 +325,9 @@ class ISM:
                 )
             raise FileNotFoundError(error_msg)
 
+        for control_file in save_dir.glob("*.!dev"):
+            control_file.unlink(missing_ok=True)
+
         segments_to_merge = [x for x in sorted(save_dir.iterdir()) if x.is_file()]
 
         if debug_logger:

unshackle/core/tracks/track.py

@@ -358,9 +358,6 @@ class Track:
                                     status_update["downloaded"] = f"URL {downloaded}"
                                 progress(**status_update)
 
-                        # see https://github.com/devine-dl/devine/issues/71
-                        save_path.with_suffix(f"{save_path.suffix}.aria2__temp").unlink(missing_ok=True)
-
                         self.path = save_path
                         events.emit(events.Types.TRACK_DOWNLOADED, track=self)