diag: fix set -e trap that was swallowing cargo tree error output - #172
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Follow-up to #171. Under set -eu, 'VAR=$(failing_command)' itself triggers immediate shell exit before STATUS=$? or echo "$OUT" can run (confirmed in run 32615730213, which exited with code 101 with zero visible cargo tree output). Wrapping the assignment in set +e / set -e lets us capture the exit code and print the real error before deciding whether to fail.