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The CI matrix includes a windows-latest job where str(Path("/Users/…")) renders
with backslashes, so the platform-parameterised sidecar-path assertions failed
there (macOS/Linux passed). Compare .as_posix() instead — separator-normalised
and portable — and note why. Pure test fix; no production-code change.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>