Fix TarReader handling of GNU sparse format 1.0 (PAX) — resolve GNU.sparse.name and GNU.sparse.realsize#125283

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copilot/fix-gnu-sparse-format-handling

Commits on Mar 6, 2026

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Fix TarReader to handle GNU sparse format 1.0 (PAX) - resolve GNU.sparse.name and GNU.sparse.realsize

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Fix copy constructor to propagate _gnuSparseRealSize; improve test assertions for data stream integrity

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