feat(celo-derive): add batch-auth enforcement grace window (mirrors op-node)#240
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Mirrors PR found celo-org/optimism#468
During the grace window [EspressoTime, EspressoTime + BatchAuthEnforcementDelaySecs), derivation keeps accepting sender-authenticated batches exactly as pre-fork this absorbs the skew between when the batcher decides a batch (L1 tip time) and when it lands (containing-block time), which the lead time previously compensated for. The batcher now switches to authenticated submission at plain activation (IsEspresso(l1Tip.Time)) with no configuration. By the time enforcement begins its auth events have been accumulating for a full lookback window, so the first enforced scan is fully populated.