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I don't have much information to help you with, but here is a NIF: https://github.com/bitwalker/picosat_elixir that I use in Ash Framework for the policy authorization.
Of course there is - the C++ Core guidelines which have existed for seven years and are updated every few months.
There's mrustc and gccrs, but you're right that all the design happens under the same umbrella as rustc, in the rust-rfc repo. Rust does now have a spec, but it is also defined by its RFCs, its reference, its nomicon, miri, etc. Breakages are prevented by thorough review processes (if needed taking years to (n)ack a specific feature), large test batteries, crater runs, etc. It is not an implementation-defined language that will change under your feet.