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How useful would this be to simply feed to an LLM and say to follow strictly?

Not useful at all. It uses up context. You need all the context you can get for the LLM read the code later for you later.

Could you just get a separate agent to do a pass over existing code and make conform? Like super linting.

Not a professional programmer, so it's a genuine question rather than a statement.

Sure you can do that. But what’s the practical point if only your agent is reading it? Your agent doesn’t care about linting.

Presumably the agent isn't only reading, but changing the code to conform.