fix(update): pass projectRoot through update command flow

Modified ai-services-unified.js, update.js tool, and update-tasks.js direct function to correctly pass projectRoot. This enables the .env file API key fallback mechanism for the update command when running via MCP, ensuring consistent key resolution with the CLI context.

scripts/modules/task-manager/update-tasks.js

@@ -21,6 +21,7 @@ import {
 import { getDebugFlag } from '../config-manager.js';
 import generateTaskFiles from './generate-task-files.js';
 import { generateTextService } from '../ai-services-unified.js';
+import { getModelConfiguration } from './models.js';
 
 // Zod schema for validating the structure of tasks AFTER parsing
 const updatedTaskSchema = z
@@ -173,7 +174,7 @@ async function updateTasks(
 	context = {},
 	outputFormat = 'text' // Default to text for CLI
 ) {
-	const { session, mcpLog } = context;
+	const { session, mcpLog, projectRoot } = context;
 	// Use mcpLog if available, otherwise use the imported consoleLog function
 	const logFn = mcpLog || consoleLog;
 	// Flag to easily check which logger type we have
@@ -312,7 +313,8 @@ The changes described in the prompt should be applied to ALL tasks in the list.`
 				prompt: userPrompt,
 				systemPrompt: systemPrompt,
 				role,
-				session
+				session,
+				projectRoot
 			});
 			if (isMCP) logFn.info('Successfully received text response');
 			else