with agent coding turned off it keeps modifying code

## Problem

## Steps to reproduce the issue

## Expected behavior

## System details (run `AWS: About` and/or `Amazon Q: About`)

- OS:
- Visual Studio Code version:
- AWS Toolkit version:
- Amazon Q version:

The issue does not provide files, tests, reproduction steps, or system details. Start by collecting the missing reproduction steps and AWS Toolkit, Amazon Q, VS Code, and OS versions, then identify where the agent-coding setting is handled and define completion as preventing code changes when that setting is off.

Written by the indexing model from the issue text.