fix: avoid unused path warning on non-Unix

[P4suta]

Split sync_parent into Unix and non-Unix implementations so Windows builds do not report an unused path parameter. Validation: cargo fmt passed; workspace Clippy with warnings denied passed; atomic tests passed; OComment dogfood reported zero findings. The full Windows workspace test run still has the pre-existing output::tests::a_first_segment_that_reads_as_a_drive_letter_is_disambiguated failure.

[coderabbitai]

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[P4suta]

Taken into #63, which also runs the suite on Windows and macOS — the reason nobody had seen the warning, or the drive-letter test failure beside it, is that cargo test only ever ran on Linux while release.yml shipped a Windows binary.