The template wrote ~/.ssh/config but didn't chmod it. OpenSSH refused
the file with 'Bad owner or permissions on /root/.ssh/config' and the
git clone failed with 'exit status 128' before fxt-backtest could
compile.
Same one-line fix that alpha-perception-template.yaml has had since
forever. Verified: lob-backtest-sweep-<new> ensure-binary now passes
the SSH check and starts cargo build.
84c32c0462