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/generate-task-files.js

@@ -35,6 +35,47 @@ function generateTaskFiles(tasksPath, outputDir, options = {}) {
 		log('info', `Validating and fixing dependencies`);
 		validateAndFixDependencies(data, tasksPath);
 
+		// Get valid task IDs from tasks.json
+		const validTaskIds = data.tasks.map(task => task.id);
+
+		// Cleanup orphaned task files
+		log('info', 'Checking for orphaned task files to clean up...');
+		try {
+			// Get all task files in the output directory
+			const files = fs.readdirSync(outputDir);
+			const taskFilePattern = /^task_(\d+)\.txt$/;
+			
+			// Filter for task files and check if they match a valid task ID
+			const orphanedFiles = files.filter(file => {
+				const match = file.match(taskFilePattern);
+				if (match) {
+					const fileTaskId = parseInt(match[1], 10);
+					return !validTaskIds.includes(fileTaskId);
+				}
+				return false;
+			});
+			
+			// Delete orphaned files
+			if (orphanedFiles.length > 0) {
+				log('info', `Found ${orphanedFiles.length} orphaned task files to remove`);
+				
+				orphanedFiles.forEach(file => {
+					const filePath = path.join(outputDir, file);
+					try {
+						fs.unlinkSync(filePath);
+						log('info', `Removed orphaned task file: ${file}`);
+					} catch (err) {
+						log('warn', `Failed to remove orphaned task file ${file}: ${err.message}`);
+					}
+				});
+			} else {
+				log('info', 'No orphaned task files found');
+			}
+		} catch (err) {
+			log('warn', `Error cleaning up orphaned task files: ${err.message}`);
+			// Continue with file generation even if cleanup fails
+		}
+
 		// Generate task files
 		log('info', 'Generating individual task files...');
 		data.tasks.forEach((task) => {