Glamsterdam devnet-7: adopt EIP-7688 SSZ types#126
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Adopts progressive SSZ merkleization (EIP-7688) for consensus types. Fixes 'Invalid payload execution bid signature' on ePBS bid submission: the ExecutionPayloadBid hash-tree-root now uses progressive-container merkleization with active fields, matching Teku's devnet-7 root instead of the old plain binary-tree root. go-eth2-client v0.1.5 -> v0.1.6-0.20260629130636-6d2ee1978c4e
The old EIP-8282 builder deposit predeploy 0x0000884d...8282 has no code on Glamsterdam devnet-7, so deposit txs succeeded as bare value transfers, emitted no builder-deposit request, and the builder never entered state.builders (registration timed out and re-deposited in a loop). Point BuilderDepositContractAddress at the devnet-7 predeploy 0x00006AE84ed173D4394de5E28F9ED56b28008282. Exit contract unchanged.
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Summary
Bumps `github.com/ethpandaops/go-eth2-client` to the `pk910/eip-7688` branch (`v0.1.5` → `v0.1.6-0.20260629130636-6d2ee1978c4e`) to adopt EIP-7688 progressive SSZ merkleization for Glamsterdam devnet-7.
Why
On devnet-7, ePBS bid submission fails with:
```
status 400: {"code":400,"message":"Invalid execution payload bid: Invalid payload execution bid signature"}
```
Root cause is the hash-tree-root, not the key/domain/fields (all verified correct: `builders[0].pubkey` matches our BLS key, domain type `0x0B000000`, Gloas fork version `0x80000038`, genesis validators root all match).
EIP-7688 changes the `ExecutionPayloadBid` merkleization from a plain binary tree to a progressive container with active-fields:
```
```
buildoor on v0.1.5 signed the old binary root while Teku (devnet-7) verifies the progressive root → BLS verification fails. The bumped go-eth2-client regenerates the SSZ code with progressive merkleization, producing the matching signing root.
Notes
Testing
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