feat(routines): add typed Rust scalar ABI projection (#90)

Add a typed in-memory scalar ABI projection with caller-reviewed enum mappings, deterministic diagnostics, and coverage for ordering, numeric fidelity, connector state, and malformed typed input.

Author: jscott3201

tools/routine-compiler/src/lib.rs

@@ -1,4 +1,5 @@
 mod declarations;
 pub mod resolution;
+pub mod scalar_abi;
 
 pub use declarations::verify_release_declarations;