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Reduce CI time for `block_verification` tests that exceed 120s on Fulu/Gloas forks. - Cache the chain segment across tests using `LazyLock<OnceCell>` (was rebuilt 10+ times independently) - Reduce chain length from 320 to 192 slots (10 epochs to 6 epochs) - Reduce `BLOCK_INDICES` from 7 to 3 - Reduce `chain_segment_varying_chunk_size` from 5 to 3 AI assisted, self reviewed. Before vs After comparison (1 sample only): * **Before**: 19 tests exceeded the 120s slow threshold. * **After**: zero exceed it. Overall: 1,890s down to 797s (-58%). ``` | Test | Before | After | Change | |------------------------------------------------------|---------|---------|---------| | chain_segment_varying_chunk_size | 239s | 98s | -59% | | invalid_signature_attester_slashing | 175s | 64s | -64% | | invalid_signature_exit | 173s | 62s | -64% | | invalid_signature_deposit | 170s | 60s | -65% | | invalid_signature_attestation | 165s | 62s | -63% | | invalid_signature_proposer_slashing | 161s | 56s | -66% | | block_gossip_verification | 154s | 91s | -41% | | invalid_signature_block_proposal | 151s | 58s | -61% | | invalid_signature_randao_reveal | 149s | 54s | -64% | | invalid_signature_gossip_block | 135s | 46s | -66% | |------------------------------------------------------|---------|---------|---------| | TOTAL | 1890s | 797s | -58% | ``` Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com> Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>