feat: implement todo list management tool for task tracking

[roomote]

Summary

This PR implements a comprehensive todo list management tool to help the model track progress during complex task execution, addressing GitHub issue #5181.

Changes

Core Implementation

• New Tool: Added tool with full CRUD operations:
  • • Add new todo items with auto-incrementing IDs
  • • Mark items as completed with timestamps
  • • Display organized view of pending and completed items
  • • Remove all completed items
  • • Clear entire todo list

Architecture Integration

• Tool Registration: Integrated into existing tool system following established patterns
• Persistent Storage: Added and properties to Task class for state persistence
• Always Available: Added to for consistent access across all modes
• Type Safety: Full TypeScript integration with proper interfaces and type definitions

Files Modified

• • Added tool name to type definitions
• • Added tool parameters and interfaces
• • Comprehensive tool description with examples
• • Main tool implementation
• • Added persistent storage properties
• • Tool registration
• • Tool execution integration
• Test snapshots updated to include new tool

Code Quality

• ✅ All tests passing
• ✅ ESLint warnings fixed (added braces around case blocks with lexical declarations)
• ✅ TypeScript type checking passed
• ✅ Follows existing code patterns and conventions

Testing

• All existing tests continue to pass
• Test snapshots updated to include new tool in system prompts
• Linting and type checking successful

Usage Example

<manage_todo_list>
<todo_action>add</todo_action>
<todo_item>Implement user authentication</todo_item>
</manage_todo_list>

<manage_todo_list>
<todo_action>list</todo_action>
</manage_todo_list>

<manage_todo_list>
<todo_action>complete</todo_action>
<item_id>1</item_id>
</manage_todo_list>

Resolves #5181

---

Important

Introduces a manage_todo_list tool with full CRUD operations, integrated into the system with persistent storage and TypeScript support.

• Behavior:
  • Implements manage_todo_list tool with CRUD operations: add, complete, list, clear completed, and clear all items.
  • Integrated into existing tool system, always available across modes.
  • TypeScript type safety with interfaces and type definitions.
• Files:
  • Task.ts: Adds todoList and nextTodoId for state persistence.
  • manageTodoListTool.ts: Main implementation of the tool's logic.
  • index.ts: Registers tool and adds description function.
• Testing:
  • Updates test snapshots to include manage_todo_list tool.
• Misc:
  • Fixes ESLint warnings and ensures all tests pass.

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[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to 5f8a1c4.

Security Overview

• 🔎 Scanned files: 20 changed file(s)

Detected Code Changes

The diff is too large to display a summary of code changes.

Reply to this PR with @delve-auditor followed by a description of what change you want and we'll auto-submit a change to this PR to implement it.

[ellipsis-dev]

Consider normalizing the todo_action input (e.g. using toLowerCase() and trimming whitespace) to accept variant capitalizations. This makes the tool more robust against user input variations.

[akaspeh1]

Hey, is this planned to be merged?