Add user-configurable terminal title prefix for todo display

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Title: Add user-configurable terminal title prefix for todo display

Description:

Claude Code displays the current todo item in the terminal tab title (e.g., "3 Layout Redesign"), which is very useful for tracking work across multiple terminal tabs.

Problem: Users cannot customize this title with their own prefix to identify which project/session the tab belongs to.

Requested features:

1. titlePrefix setting in .claude/settings.json - e.g., "titlePrefix": "ImageSys" ? displays "ImageSys: 3 Layout Redesign"
2. titleFormat setting for full control - e.g., "titleFormat": "$PREFIX | $TODO_NUM $TODO_TEXT"
3. Option to disable todo-based title updates: "updateTerminalTitle": false
4. Immediate title reset when todo list is cleared (currently caches old title)

Use case: Running multiple Claude Code sessions in different projects - need to distinguish tabs at a glance.

Proposed Solution

Requested features:

titlePrefix setting in .claude/settings.json - e.g., "titlePrefix": "ImageSys" ? displays "ImageSys: 3 Layout Redesign"
titleFormat setting for full control - e.g., "titleFormat": "$PREFIX | $TODO_NUM $TODO_TEXT"
Option to disable todo-based title updates: "updateTerminalTitle": false
Immediate title reset when todo list is cleared (currently caches old title)

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_