agentfs run: Fix SSH inside user namespace by bypassing system configs #164
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Inside the user namespace, root-owned files in /etc/ssh/ssh_config.d/ appear with invalid ownership (unmapped uid), causing SSH to reject them with "Bad owner or permissions" errors.
Set GIT_SSH_COMMAND to use only ~/.ssh/config (or /dev/null if it doesn't exist), bypassing the problematic system configs while preserving user settings.
Fixes #163