artifact_fuzz.zig adds seven parameterized targets registered in fuzz_tests.zig: parse() on raw garbage, a structured generator that dispatches through all sixteen parseXCard entry points, tokenizeCardLine, decodeEscapes, classifyTimestamp, the frame/stripSignatureWrapper/ verifyZCard trio, and the pathname/wiki-name/reserved/compare predicates. artifact.zig gains matching fixed-seed inline blocks plus a parse() allocation-failure test, mirroring delta.zig's existing fuzz section. check-in: e46e97cb76 user: dmestas tags: trunk