Mirrors the layout of octive-lean: lakefile, justfile, gitignored
upstream clone, a top-level library module, and a Main entry point
that switches between REPL and file execution.
Module skeleton in GolangLean/:
Token, AST — real ports of go/token and go/ast
Scanner, Parser — stubs throwing notImpl, point at upstream
Value, Env, Error — runtime data shapes
Eval, Builtins, REPL — stubs that compile and run as a placeholder
PureEval, BigStep,
ValueEquiv — formal-semantics layer (mirroring octive-lean)
where cross-language proof eventually lives.
The proof layer is shaped identically to octive-lean's so that
theorems about Go semantics will share their form with the Octave
ones — that shared shape is the candidate for the future
cross-language core.
Upstream reference go-upstream/ (shallow clone of golang/go) is
gitignored.
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