This codex scratchpad feature looks promising.i constantly send multiple questions to different parts of my codebase in different terminals or views to get an isolated answer for a specific review or topic.with this feature, you can just use one view to start multiple chats, like in a to-do app.if these chats build up memory, it would be very useful to have a dependency graph showing how topics connect, including where a solution has already been discussed in other threads.

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