Convert an existing task into a subtask.
Convert an existing task into a subtask. Arguments: $ARGUMENTS Parse parent ID and task ID to convert. ## Task Conversion Converts an existing standalone task into a subtask of another task. ## Argument Parsing - "move task 8 under 5" - "make 8 a subtask of 5" - "nest 8 in 5" - "5 8" → make task 8 a subtask of task 5 ## Execution ## Pre-Conversion Checks 1. **Validation** - Both tasks exist and are valid - No circular parent relationships - Task isn't already a subtask - Logical hierarchy makes sense 2. **Impact Analysis** - Dependencies that will be affected -...