Fix incorrect causual attention mask caused by M-Rope#15474

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rujialiu wants to merge 2 commits intoggml-org:masterfrom

rujialiu:mrope-fix

Commits on Aug 21, 2025

Append mrope positions to the traditional llm pos, otherwise causal atten masking will break. See #13694. This also allows us to remove some previous workarounds
rujialiu
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Commits on Aug 24, 2025

Added notes about what is actually stored in batch's `pos`
rujialiu
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