Rewrite download functions to use FILE pointers and improve resumable downloads#31

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Copilot wants to merge 3 commits intoresumablefrom

copilot/fix-e9ee9082-8afc-47ef-a844-129abf5d930d

Commits on Sep 13, 2025

Add resumable downloads for llama-server model loading
ericcurtin
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Initial plan
Copilot
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Rewrite write_file, curl_perform_with_retry, and common_download_file_single functions with FILE pointer approach and improved resumable downloads

Copilot
and
ericcurtin
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