Add hardened SSH client config - #22
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- Add ssh/config with secure defaults for Host *: HashKnownHosts, AddKeysToAgent, IdentitiesOnly, VisualHostKey, StrictHostKeyChecking ask - Add a github.com Host block using ~/.ssh/id_ed25519 - Symlink ssh/config -> ~/.ssh/config in assimilate.sh and enforce chmod 700 ~/.ssh + chmod 600 ~/.ssh/config (SSH rejects loose permissions)
The tracked config replaces ~/.ssh/config wholesale, which dropped the existing machine-local Host entry and the UseKeychain setting. Include config.local (untracked; repo is public) preserves per-machine hosts, and IgnoreUnknown lets UseKeychain coexist with Linux ssh.
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Summary
Test Plan
ssh -G:IdentitiesOnlychanged fromnotoyes.bash -n assimilate.shandgit diff --check.