fix: prevent tag corruption in bulk updates (#856)

* fix(task-manager): prevent tag corruption in bulk updates and add tag preservation test

- Fix writeJSON call in scripts/modules/task-manager/update-tasks.js (line 469) to include projectRoot and tag parameters.
- Ensure tagged task lists maintain data integrity during bulk updates, preventing task disappearance in tagged contexts.
- Update MCP tools to properly pass tag context through the call chain.
- Introduce a comprehensive test case to verify that all tags are preserved when updating tasks, covering both master and feature-branch scenarios.

Addresses an issue where bulk updates could corrupt tasks.json in tagged task list structures, reinforcing task management robustness.

* style(tests): format task data in update-tasks test

mcp-server/src/core/direct-functions/update-tasks.js

@@ -21,7 +21,7 @@ import {
  */
 export async function updateTasksDirect(args, log, context = {}) {
 	const { session } = context;
-	const { from, prompt, research, tasksJsonPath, projectRoot } = args;
+	const { from, prompt, research, tasksJsonPath, projectRoot, tag } = args;
 
 	// Create the standard logger wrapper
 	const logWrapper = createLogWrapper(log);
@@ -75,7 +75,8 @@ export async function updateTasksDirect(args, log, context = {}) {
 			{
 				session,
 				mcpLog: logWrapper,
-				projectRoot
+				projectRoot,
+				tag
 			},
 			'json'
 		);