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.

.taskmaster/config.json

@@ -32,10 +32,7 @@
     "defaultTag": "master"
   },
   "tags": {
-    "autoSwitchOnBranch": false,
-    "gitIntegration": {
-      "enabled": false,
-      "autoSwitchTagWithBranch": false
-    }
+    "enabledGitworkflow": false,
+    "autoSwitchTagWithBranch": false
   }
-}
+}