chore: apply ruff auto-fixes and remove dead AST scripts

project_manager.py

@@ -242,7 +242,6 @@ def load_track_history(track_id: str, base_dir: Union[str, Path] = ".") -> list[
     Loads the discussion history for a specific track from its state.toml.
     Returns a list of entry strings formatted with @timestamp.
     """
- from models import TrackState
  state = load_track_state(track_id, base_dir)
  if not state:
   return []
@@ -260,7 +259,6 @@ def save_track_history(track_id: str, history: list[str], base_dir: Union[str, P
     Saves the discussion history for a specific track to its state.toml.
     'history' is expected to be a list of formatted strings.
     """
- from models import TrackState
  state = load_track_state(track_id, base_dir)
  if not state:
   return
@@ -277,7 +275,6 @@ def get_all_tracks(base_dir: Union[str, Path] = ".") -> list[dict[str, Any]]:
     Handles missing or malformed metadata.json or state.toml by falling back
     to available info or defaults.
     """
- from models import TrackState
  tracks_dir = Path(base_dir) / "conductor" / "tracks"
  if not tracks_dir.exists():
   return []