[no-ci] Follow-on to cuda.core AGENTS.md

[mdboom]

This is a follow up to #2107 based on this comment and an offline discussion about typing.TYPE_CHECK.

[rwgk]

I'd reword, in style of an actual guidance, but LGTM otherwise.

[leofang]

LGTM but I'd let @Andy-Jost take a look on TYPE_CHECKING as he seems to have reservation based on the offline chat.

[Andy-Jost]

LGTM but I'd let @Andy-Jost take a look on TYPE_CHECKING as he seems to have reservation based on the offline chat.

The wording here looks fine to me. Regarding TYPE_CHECKING, I'm mostly confused. I'm looking for rules (a), (b), (c), ... such that following them avoids certain identifiable problems, e.g., with circular imports, tools relying on type annotations, and so on. The rules would probably need to cover package structure, __init__.py file contents, TYPE_CHECKING blocks, and other [c]import guidelines.

AFAICT, we have not identified either the rules or even the complete list of problems we need to avoid. None of that should gate this PR, though.

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