Add write-only mode option for todo tool

[Copilot]

The todo tool now supports a write-only mode to prevent unnecessary read operations during new chat turns, since tool invocations remain in context for the agent.

Changes

New Configuration Setting:

• Added chat.todoListTool.writeOnly boolean setting (default: false)
• Marked as experimental to match the existing todo tool setting

Dynamic Schema Generation:

• Created createManageTodoListToolData(writeOnly) function for conditional schema building
• In write-only mode: removes the operation parameter entirely, only requires todoList
• In normal mode: preserves existing behavior with both 'read' and 'write' operations

Tool Implementation:

• Updated ManageTodoListTool constructor to accept writeOnly parameter
• Modified invoke() method to always perform write operations in write-only mode
• Adapted prepareToolInvocation() to handle optional operation parameter
• Tool registration now reads configuration to instantiate appropriate version

Example Usage

Normal mode (existing behavior):

{
  "operation": "write",
  "todoList": [{"id": 1, "title": "Fix bug", "description": "...", "status": "not-started"}]
}

Write-only mode (new):

{
  "todoList": [{"id": 1, "title": "Fix bug", "description": "...", "status": "not-started"}]
}

The write-only mode eliminates redundant context checking while maintaining full backward compatibility when the setting is disabled.

Fixes #260687.

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