User asked the script not to touch their SSH config. Reverted the
auto-ssh-keyscan; the script now only READS ~/.ssh/known_hosts (via
ssh-keygen -F) and, when the entry is missing, exits with explicit
manual instructions for verifying the host key and registering an
identity key in Gitea. Identical behavior on the happy path; clearer
diagnostics on the unhappy path; zero modification of ~/.ssh anywhere.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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