feat(mcp): Add tagInfo to responses and integrate ContextGatherer

Enhances the MCP server to include 'tagInfo' (currentTag, availableTags) in all tool responses, providing better client-side context.

- Introduces a new 'ContextGatherer' utility to standardize the collection of file, task, and project context for AI-powered commands. This refactors several task-manager modules ('expand-task', 'research', 'update-task', etc.) to use the new utility.

- Fixes an issue in 'get-task' and 'get-tasks' MCP tools where the 'projectRoot' was not being passed correctly, preventing tag information from being included in their responses.

- Adds subtask '103.17' to track the implementation of the task template importing feature.

- Updates documentation ('.cursor/rules', 'docs/') to align with the new tagged task system and context gatherer logic.

scripts/modules/task-manager/research.js

@@ -11,7 +11,12 @@ import { highlight } from 'cli-highlight';
 import { ContextGatherer } from '../utils/contextGatherer.js';
 import { FuzzyTaskSearch } from '../utils/fuzzyTaskSearch.js';
 import { generateTextService } from '../ai-services-unified.js';
-import { log as consoleLog, findProjectRoot, readJSON } from '../utils.js';
+import {
+	log as consoleLog,
+	findProjectRoot,
+	readJSON,
+	flattenTasksWithSubtasks
+} from '../utils.js';
 import {
 	displayAiUsageSummary,
 	startLoadingIndicator,
@@ -579,42 +584,6 @@ function displayResearchResults(result, query, detailLevel, tokenBreakdown) {
 	console.log(chalk.green('✅ Research completed'));
 }
 
-/**
- * Flatten tasks array to include subtasks as individual searchable items
- * @param {Array} tasks - Array of task objects
- * @returns {Array} Flattened array including both tasks and subtasks
- */
-function flattenTasksWithSubtasks(tasks) {
-	const flattened = [];
-
-	for (const task of tasks) {
-		// Add the main task
-		flattened.push({
-			...task,
-			searchableId: task.id.toString(), // For consistent ID handling
-			isSubtask: false
-		});
-
-		// Add subtasks if they exist
-		if (task.subtasks && task.subtasks.length > 0) {
-			for (const subtask of task.subtasks) {
-				flattened.push({
-					...subtask,
-					searchableId: `${task.id}.${subtask.id}`, // Format: "15.2"
-					isSubtask: true,
-					parentId: task.id,
-					parentTitle: task.title,
-					// Enhance subtask context with parent information
-					title: `${subtask.title} (subtask of: ${task.title})`,
-					description: `${subtask.description} [Parent: ${task.description}]`
-				});
-			}
-		}
-	}
-
-	return flattened;
-}
-
 /**
  * Handle follow-up questions in interactive mode
  * @param {Object} originalOptions - Original research options