fix: normalize task IDs to numbers on load to fix comparison issues

- Added normalizeTaskIds function to convert string IDs to numbers
- Applied normalization in readJSON for all code paths
- Fixed set-task-status, add-task, and move-task to normalize IDs when working with raw data
- Exported normalizeTaskIds function for use in other modules
- Added test case for string ID normalization

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/modules/task-manager/set-task-status.js

@@ -7,7 +7,8 @@ import {
 	readJSON,
 	writeJSON,
 	findTaskById,
-	ensureTagMetadata
+	ensureTagMetadata,
+	normalizeTaskIds
 } from '../utils.js';
 import { displayBanner } from '../ui.js';
 import { validateTaskDependencies } from '../dependency-manager.js';
@@ -76,6 +77,8 @@ async function setTaskStatus(tasksPath, taskIdInput, newStatus, options = {}) {
 			tag,
 			_rawTaggedData: rawData
 		};
+		
+		normalizeTaskIds(data.tasks);
 
 		if (!data || !data.tasks) {
 			throw new Error(`No valid tasks found in ${tasksPath}`);