Improve error handling in write_file and simplify URL password hiding with regex#33

Copilot wants to merge 2 commits intoresumableericcurtin/llama.cpp:resumablefrom

copilot/fix-d62a1a4e-bc64-4b46-928d-7d71cb159b9cericcurtin/llama.cpp:copilot/fix-d62a1a4e-bc64-4b46-928d-7d71cb159b9cCopy head branch name to clipboard