feat(wam-c): support ground-list atom_codes reverse mode - #4267
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WAM-C atom_codes/2 now builds an atom from a finite, fully bound proper Unicode code list, closing a bounded C/Rust parity gap. The converter accepts both VAL_LIST and compiled [|]/2 list cells, validates scalar values, interns the result, and binds through the normal trail. Open/cyclic or invalid lists remain explicit WAM_ERR_UNSUPPORTED; U+0000 is unsupported because C atoms use NUL-terminated strings. The generated-C/SWI suite covers ASCII, empty, multibyte, malformed inputs, and caller backtracking rollback. Validation: focused atom_codes suite, C target suite, adjacent atom_chars and char_code suites, and ASan/UBSan run pass (LeakSanitizer unavailable under ptrace).