The header said to export tunables before running, but its own
`curl ... | sudo bash` entrypoint resets the environment, so an
exported FELIS_INSTALL_MODE or FELIS_NANO_LISTEN never reached the
installer. The header now shows the two forms that do arrive: the
variable named on the sudo line, or export followed by sudo -E.
The nano summary's hint for a proxy on another machine now prints a
sudo line that can be pasted as is, instead of "re-run with
FELIS_NANO_LISTEN=...". Comment and log text only.
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