Project_rules.md

### What feature would you like to be added or updated?

Hello,
After creating projects_rules.md, it's appears we must to always ask agent to use if not agent not use rules.

Please add option(checkbox) to force agent to always use project rules if we want.

Regards.

### Why do you need this feature?

because agent not use rules by defaut

### Additional information that you believe is relevant to this feature request

_No response_

The issue names project_rules.md but no implementation file or test. First locate where that file is discovered and where agent options are defined, then clarify how the proposed checkbox should persist and affect runs. Done means the option is available, its force behavior is covered by tests, and the project rules are consistently applied when enabled.

Written by the indexing model from the issue text.