As of Clarinet 2.4.0, devnet can run the blockchain in Nakamoto mode.
Once your devnet reaches the right block height, it will deploy the pox-4.clar contract and run in
Epoch 2.5.
From there, Clarinet will send stack-stx and stack-extend requests to the new PoX contract.
In Nakamoto mode, devnet has 2 signers. Eventually, you can observe the
vote-for-aggregate-public-key transactions that they send.
Do not expect to reach Epoch 3.0 with Clarinet 2.4.0. This release is focusing on Epoch 2.5.
Epoch 3.0, with fast blocks and others improvements, will come in a future release.