Cells 4-6 complete and verified (480/480 rows, 16/16 cfg coverage, zero
errors each): aarch64/12345 enabled+disabled (a real pair: 310.5s vs
283.0s, +9.7% in the expected direction), riscv64/13579 disabled.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
