fix(tests): make file_job temp dirs unique under parallel execution#75
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A nanosecond timestamp plus PID can collide when parallel test threads hit the same clock tick, failing create_dir with EEXIST. An atomic counter suffix makes each directory unique. Closes #70
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Closes #70. The flake hit PR #74's macOS CI job (
File exists (os error 17)), so fixing the root cause instead of rerunning: nanosecond timestamp + PID isn't unique across parallel test threads; an atomic counter suffix is.Validated: full src-tauri suite run 5× consecutively on macOS, 38/38 each time; clippy clean.
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