gnucobol-rs-ffi vs gnucobol-rs-link vs gnucobol-rs

C-ABI shim for gnucobol-rs: exposes the native-Rust libcob algorithms (cob_move, accessors, ...) with `extern "C"` linkage so a C program can link gnucobol-rs as a drop-in libcob replacement. The ONLY crate that uses unsafe (the C boundary); the gnucobol-rs core stays forbid(unsafe_code).

gnucobol-rs inter-program linkage: BY REFERENCE / BY CONTENT / BY VALUE parameter-passing byte semantics over the oracle-proven gnucobol-rs core (the CALL.LAYOUT court). Dynamic dlopen loading is a deferred, separately-gated feature.

Faithful Rust port of GnuCOBOL packed-decimal (COMP-3), zoned, and display numeric byte semantics and the MOVE conversions between them, proven byte-identical against the GnuCOBOL 3.2 libcob oracle. Plus a PIC->field-model parser , DATA DIVISION record-layout engine, , COPY+REPLACING copybook expander, pure-Rust decimal arithmetic, VALUE initial-record images, PIC P-scaling, OCCURS DEPENDING ON physical-max layout, LEVEL-88 condition-name predicates, and SET-TO-TRUE byte construction. Not a compiler; not arithmetic.