Task 80982658386

test: use ForkGenerator to deduplicate reorg test code

2026-06-12 07:45:54 completed 2025-11-followup_fix_reorgs_tests 6dd6819a4bf65dcd49e399c3a09918324e508021

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[meta] record frozen commit

2025-11-followup_fix_reorgs_tests