DS

Add chat.messages.transform plugin hook

1

## Summary - Adds a `chat.messages.transform` hook that allows plugins to modify the message array before it's sent to the AI provider - Enables plugins to prune, filter, or transform...

add experimental.chat.system.transform hook

1

Add a system prompt transform hook to allow plugins to alter system messages. Plugins receive a mutable `string[]` containing the system prompt parts and can modify, add, or remove entries....

## Summary - Fixes system prompt caching when plugins modify `output.system` The caching logic in `transform.ts` expects exactly 2 system parts. If a plugin pushes additional parts, they won't be...