feat(rust): make generated Rust CST/AST hygienic against user-shadowe… - #25
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…d std Name std items by absolute path in the emitted cst.rs and qualify std prelude spellings in the emitted ast.rs, so a grammar whose rule names collide with prelude items still produces compilable output. Extends the fixture crate with keyed and multi-keyed regions, adds a generated-code gate that shadows every qualified std spelling, and pins the AST guide's quick start on both backends.
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…d std
Name std items by absolute path in the emitted cst.rs and qualify std prelude spellings in the emitted ast.rs, so a grammar whose rule names collide with prelude items still produces compilable output. Extends the fixture crate with keyed and multi-keyed regions, adds a generated-code gate that shadows every qualified std spelling, and pins the AST guide's quick start on both backends.