Feature Request: Separate persistent custom rule settings for each individual chat dialog

What variant of Codex are you using?

应用

What feature would you like to see?

Use Case

When building a project with multiple chat dialogs inside Codex, every single dialog needs its own exclusive set of custom rules.

Current Issue

Right now the only way to add custom constraints is sending prompt text into the chat history. As conversation context becomes longer and longer, the model will gradually forget or ignore these rules.

Feature I Want

Add a standalone custom rule configuration panel bound to each dialog window:

1. Custom rules are stored together with the dialog, completely separated from normal chat messages.
2. These custom rules act as mandatory fixed instructions, automatically attached to every model request.
3. Rules will never disappear or be ignored no matter how large the conversation context gets.
4. Editing custom rules for one dialog will not interfere with rules set on other dialogs in the same project.

Core Demand

I need an independent dedicated custom setting module, instead of relying on sending chat messages to pass rules.

Additional information

_No response_