fix(trg): gate relative_path_from behind cfg(unix)

[yordis]

• Windows CI promotes dead-code warnings to errors, so the unix-only helper must be cfg-gated to keep the cross-platform build green.

[cursor]

PR Summary

Low Risk
Single cfg attribute on a helper already only used on Unix; no runtime behavior change on supported platforms.

Overview
Adds #[cfg(unix)] to relative_path_from in layout.rs so the Unix-only symlink helper is not compiled on Windows.

That aligns the function with its only caller (inside the existing Unix link_to_workspace branch) and avoids dead_code failures when Windows CI treats unused items as errors.

^{Reviewed by Cursor Bugbot for commit 6118865. Bugbot is set up for automated code reviews on this repo. Configure here.}

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ℹ️ Review info

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 4ce7d54 and 6118865.

📒 Files selected for processing (1)

• crates/trg/src/agentskills/layout.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/fix-windo

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