install_copy
Diagnostic `nanook::cli::install_copy`
Summary
failed to copy `{0}` -> `{1}`
Help
verify the destination is writable and has enough space
Details
When this fires
nanook install got past picking a destination but the actual std::fs::copy from the running binary into the target dir failed. Roots: destination filesystem is full, mounted read-only, hit a quota, or perms changed between the writability probe and the real copy.
What to check
Check free space (df -h <dst>). For system paths, retry under sudo or pass --to ~/.local/bin to land in a user-owned dir.