Fix: update parameter name from 'mode' to 'mode_slug' for consistency in new task usage

Author: d-oit

src/core/prompts/__tests__/__snapshots__/system.test.ts.snap

@@ -338,18 +338,18 @@ Example: Requesting to switch to code mode
 Description: Create a new task with a specified starting mode and initial message. This tool instructs the system to create a new Cline instance in the given mode with the provided message.
 
 Parameters:
-- mode: (required) The slug of the mode to start the new task in (e.g., "code", "ask", "architect").
+- mode_slug: (required) The slug of the mode to start the new task in (e.g., "code", "ask", "architect").
 - message: (required) The initial user message or instructions for this new task.
 
 Usage:
 <new_task>
-<mode>your-mode-slug-here</mode>
+<mode_slug>your-mode-slug-here</mode_slug>
 <message>Your initial instructions here</message>
 </new_task>
 
 Example:
 <new_task>
-<mode>code</mode>
+<mode_slug>code</mode_slug>
 <message>Implement a new feature for the application.</message>
 </new_task>