feat(external-node): save protocol version before opening a batch #3136
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What ❔
Moved protocol version fetching a bit earlier in the flow for EN so that it is present by the time we insert the corresponding unsealed batch.
Why ❔
Persisted unsealed batches now uniformly have protocol version present in them (both main and external nodes).
Checklist
zkstack dev fmt
andzkstack dev lint
.