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The GitHub reachability probe (curl --head, 10s max) was gated only on --validate-only, so a --dry-run — which prints a plan and exits without ever cloning — could fail with exit 3 "cannot reach https://github.com" whenever the curl lost a race for sockets/DNS. Reproducible at ~15% by running 60 dry-runs concurrently, and the cause of intermittent red in the D5 detect-first tests, which call this exact path. The probe now also skips under --dry-run: requiring the network for a plan-print buys nothing and costs a real failure mode. Real installs still fail fast when offline rather than hanging git clone. Absorbs PR #2540 by @CarringtonCreative (applied via git am -3; 26 tests pass across test/gbrain-detect-install.test.ts + test/egress-receipt-wiring.test.ts). Fixes the offline/flake half of #2536. Co-authored-by: Carrington Dennis <carrdenn3@gmail.com> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>