rust-index: document safety invariants being upheld for every `unsafe` block We've added a lot of `unsafe` code that shares Rust structs with Python. While this is unfortunate, it is also unavoidable, so let's at least systematically explain why each call to `unsafe` is sound. If any of the unsafe code ends up being wrong (because everyone screws up at some point), this change at least continues the unspoken rule of always explaining the need for `unsafe`, so we at least get a chance to think.

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