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The -z flag (NUL-terminated line mode) had zero integration test coverage. Adds 5 behavioral tests: file input, stdin pipe, single record, byte mode, and multi-file headers. Uses hex comparison via od to handle NUL bytes that bash variables strip.
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Summary
-z(NUL-terminated line mode)-z -n,-z -c, stdin pipe, and multi-file with headersodto correctly handle NUL bytesAudit findings addressed
--silent: already works (verified)-zintegration tests: added (5 tests)-w/-zintegration tests: already presentTest results
zig build test: all passjust it-util head: 88/88 passjust it-util cut: 70/70 pass