add "cargo" tool that minimizes output #20
Description
The idea here is to offer an MCP tool that allows building/checking/running tests. The motivation is to offer structured output to the agent that does not waste tokens unless there's something that merits its attention. But what I would want to do is to "pipe" the full output (or something like it) out over IPC so that the VSCode extension can have it appear in the Activity Window. This would be a new section that is added in addition to the walkthroughs.
Since this will be a user-visible feature, I think it merits an RFD.
I created this research report that I would add into the mdbook's research report section to guide the agent in how to invoke cargo with more structured output.