Add support for /compact #4924
Description
What version of the VS Code extension are you using?
0.4.19
Which IDE are you using?
VS Code
What platform is your computer?
Microsoft Windows NT 10.0.26200.0 x64
What steps can reproduce the bug?
After using the tool for a short while, the conversation is unable to continue, with the error Codex ran out of room in the model's context window. Start a new conversation or clear earlier history before retrying.
What is the expected behavior?
Similar to the CLI tool, the chat should be condensed and summarised to free up space and allow the conversation to continue. This would be either automatic when the context window limit is reached, or manually through a button.
What do you see instead?
When this limit is hit, the conversation has to be abandoned and a new chat started.
Additional information
No response