Migrate Tasks.Git.GetUntrackedFiles to multithreaded task model#1735

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jankratochvilcz:mt/get-untracked-files

Commits on Jul 8, 2026

Migrate Tasks.Git.GetUntrackedFiles to multithreaded task model

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Align shared RepositoryTask change with sibling PR; disable test parallelization

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Address review feedback: graceful empty-path handling

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Reject non-fully-qualified paths instead of absolutizing (GetUntrackedFiles)

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Address review feedback: clarify comments (GetUntrackedFiles)

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Shorten IsPathFullyQualified doc and reject-relative guard comments

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Use shared MockEngine4 test double

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