feat(derivation): skip L1 fill-gap derivation for pre-upgrade blocks

[tomatoishealthy]

In local-verify mode, when a batch's last block is missing locally and its firstBlockNumber is below the verifier's VerificationStartHeight, wait for P2P/blocksync backfill instead of running L1 fill-gap derivation. Pre-upgrade (pbft-era) blocks are held by geth but not tracked at the node layer, so reconstructing them via L1 would diverge geth's height from the node's on restart. VerificationStartHeight returns MaxUint64 while the verifier history is empty, so every missing block is treated as pre-upgrade until it loads.

Also log a one-line sequencer-contract state snapshot at verifier startup (active sequencer + verification start height), and bump morph-l2/go-ethereum to the latest pinned revision.

[claude]

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