The README gains the child mnemonic that `keyfunc mnemonic` prints for
the abandon ... about mnemonic at index 0, asserted by the README
vectors test, and says that `ssh install` needs the host key already
known, with the two ways round it.
`ssh install` now also lists `.ssh/.` before fetching. A `.ssh` that can
be read but not entered lists as empty, so the fetch read it as holding
no file and tried an upload that could only fail. The listing of
`.ssh/.` fails instead, and the tool refuses before any upload, saying
the directory cannot be entered. The test that failed the put with a
file where `.ssh` belongs now uses a `.ssh` of mode 500.
Model: opus-5-5