Fix Windows git untracked status for canonicalized paths

[starSumi]

Summary

• follow up the lingering Windows CI failure in vcs::git::tests::test_git_service_untracked_file that still reproduced on GitHub Actions after fix: handle Windows verbatim git paths #160
• canonicalize both the queried file path and repo root before deriving a Windows repo-relative path
• add a Windows regression test that calls file_status() with a canonicalized file path

Why

Historical Windows runs for #160 still failed with left: Clean, right: Untracked on the GitHub runner, while local Windows repro remained inconsistent. This keeps the fix scoped to the remaining path-shape mismatch and preserves the earlier fallback logic.

Validation

• cargo test --locked --bin ferrite vcs::git::tests::test_git_service_untracked_file -- --exact --nocapture
• cargo test --locked --bin ferrite vcs::git::tests:: -- --nocapture
• cargo check --locked --bin ferrite
• git diff --check -- src/vcs/git.rs

All cargo commands were run with:

• CARGO_BUILD_JOBS=1
• CARGO_TARGET_DIR=E:\Zero_Base\sumi_os\playground\Ferrite-windows-git-untracked-fix\target

Notes

• follow-up to fix: handle Windows verbatim git paths #160
• existing warnings reported by cargo check are outside this patch

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[OlaProeis]

Merged into 0.3.1-experimental locally and pushed. Thanks for the follow-up fix and for getting Windows CI green.