Scheduled mainnet isthmus hard fork

We've scheduled the isthmus hard fork at timestamp 1755716401 (Wednesday, August 20, 2025 7:00:01 PM UTC)

Upgrade steps
Use the new updated fraxtal-op-geth v1.101511.1-frax-1.3.0 and fraxtal-op-node v1.13.5-frax-1.2.0.
Set the op-geth environment variables and op-node rollup config to activate the hard fork at the specified timestamp
More details can be found in the commit c6aa921