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Pierre Warnier
3ed6188aea
Fixes #11 — tests/by-util/test_passwd.rs: 15 integration tests following uutils convention (status format, exit codes, lock/unlock cycle, aging, lifecycle, quiet mode, error cases). Fixes #12 — fuzz targets for all parsers: fuzz_passwd_parse, fuzz_shadow_parse, fuzz_login_defs_parse, fuzz_validate_username. All must not panic on any input. Fixes #15 — proptest round-trip tests for PasswdEntry, ShadowEntry: generate random valid entries, serialize, parse back, compare. Fixes #16 — parser edge case tests: wrong field counts, empty files, roundtrip via file I/O, negative values, boundary values, unicode rejection, null bytes, mixed whitespace, duplicate keys, key-only lines. Also: CONTRIBUTING.md, SECURITY.md created. README.md and CLAUDE.md updated to reflect uucore integration and current project state. 142 tests passing on Debian/Alpine/Fedora, zero clippy warnings.