feat(backend): Implement discussion branching and take promotion

src/project_manager.py

@@ -424,3 +424,36 @@ def calculate_track_progress(tickets: list) -> dict:
   "todo": todo
  }
 
+
+def branch_discussion(project_dict: dict, source_id: str, new_id: str, message_index: int) -> None:
+ """
+ Creates a new discussion in project_dict['discussion']['discussions'] by copying 
+ the history from source_id up to (and including) message_index, and sets active to new_id.
+ """
+ if "discussion" not in project_dict or "discussions" not in project_dict["discussion"]:
+  return
+ if source_id not in project_dict["discussion"]["discussions"]:
+  return
+ 
+ source_disc = project_dict["discussion"]["discussions"][source_id]
+ new_disc = default_discussion()
+ new_disc["git_commit"] = source_disc.get("git_commit", "")
+ # Copy history up to and including message_index
+ new_disc["history"] = source_disc["history"][:message_index + 1]
+ 
+ project_dict["discussion"]["discussions"][new_id] = new_disc
+ project_dict["discussion"]["active"] = new_id
+
+def promote_take(project_dict: dict, take_id: str, new_id: str) -> None:
+ """Renames a take_id to new_id in the discussions dict."""
+ if "discussion" not in project_dict or "discussions" not in project_dict["discussion"]:
+  return
+ if take_id not in project_dict["discussion"]["discussions"]:
+  return
+ 
+ disc = project_dict["discussion"]["discussions"].pop(take_id)
+ project_dict["discussion"]["discussions"][new_id] = disc
+ 
+ # If the take was active, update the active pointer
+ if project_dict["discussion"].get("active") == take_id:
+  project_dict["discussion"]["active"] = new_id