feat(move-tasks): Implement move command for tasks and subtasks

Adds a new CLI command and MCP tool to reorganize tasks and subtasks within the hierarchy. Features include:
- Moving tasks between different positions in the task list
- Converting tasks to subtasks and vice versa
- Moving subtasks between parents
- Moving multiple tasks at once with comma-separated IDs
- Creating placeholder tasks when moving to new IDs
- Validation to prevent accidental data loss

This is particularly useful for resolving merge conflicts when multiple team members create tasks on different branches.

scripts/modules/task-manager.js

@@ -23,6 +23,7 @@ import updateSubtaskById from './task-manager/update-subtask-by-id.js';
 import removeTask from './task-manager/remove-task.js';
 import taskExists from './task-manager/task-exists.js';
 import isTaskDependentOn from './task-manager/is-task-dependent.js';
+import moveTask from './task-manager/move-task.js';
 import { readComplexityReport } from './utils.js';
 // Export task manager functions
 export {
@@ -46,5 +47,6 @@ export {
 	findTaskById,
 	taskExists,
 	isTaskDependentOn,
+	moveTask,
 	readComplexityReport
 };