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## Summary This just replaces one temporary solution to recursive protocols (the `SelfReference` mechanism) with another one (track seen types when recursively descending in `normalize` and replace recursive references with `Any`). But this temporary solution can handle mutually-recursive types, not just self-referential ones, and it's sufficient for the primer ecosystem and some other projects we are testing on to no longer stack overflow. The follow-up here will be to properly handle these self-references instead of replacing them with `Any`. We will also eventually need cycle detection on more recursive-descent type transformations and tests. ## Test Plan Existing tests (including recursive-protocol tests) and primer. Added mdtest for mutually-recursive protocols that stack-overflowed before this PR.