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.

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

@@ -20,7 +20,7 @@ import { createLogWrapper } from '../../tools/utils.js';
  */
 export async function updateTasksDirect(args, log, context = {}) {
 	const { session } = context; // Extract session
-	const { tasksJsonPath, from, prompt, research } = args;
+	const { tasksJsonPath, from, prompt, research, projectRoot } = args;
 
 	// Create the standard logger wrapper
 	const logWrapper = {
@@ -85,21 +85,23 @@ export async function updateTasksDirect(args, log, context = {}) {
 	const useResearch = research === true;
 	// --- End Input Validation ---
 
-	log.info(`Updating tasks from ID ${fromId}. Research: ${useResearch}`);
+	log.info(
+		`Updating tasks from ID ${fromId}. Research: ${useResearch}. Project Root: ${projectRoot}`
+	);
 
 	enableSilentMode(); // Enable silent mode
 	try {
 		// Create logger wrapper using the utility
 		const mcpLog = createLogWrapper(log);
 
-		// Execute core updateTasks function, passing session context
+		// Execute core updateTasks function, passing session context AND projectRoot
 		await updateTasks(
 			tasksJsonPath,
 			fromId,
 			prompt,
 			useResearch,
-			// Pass context with logger wrapper and session
-			{ mcpLog, session },
+			// Pass context with logger wrapper, session, AND projectRoot
+			{ mcpLog, session, projectRoot },
 			'json' // Explicitly request JSON format for MCP
 		);