Log the SSV Boole fork schedule at boot (analogous to the Gloas 'fork scheduled' log)

[iurii-ssv]

Context

External monitoring / test tooling needs to confirm, per node, which SSV epoch the Boole fork is scheduled at. The Gloas/ePBS fork already logs this at boot — beacon/goclient/spec.go: gc.log.Info("Gloas (ePBS) fork scheduled", zap.Uint64("epoch", …)) — but there is no equivalent for the SSV Boole fork. The node knows the epoch at boot (networkConfig.SSV.Forks.Boole, used at runtime in cli/operator/node.go, operator/duties/scheduler.go, operator/validator/controller.go, …) but never logs the schedule.

This blocks a clean fork-awareness check in Aetheria's upcoming (boole) fork-transition suite (ssvlabs/aetheria#168): with no boot log, the suite has to infer the fork epoch from the first Boole topic subscription rather than read it directly from each node and cross-check agreement across the fleet (the way the gloas (transition) suite keys on Gloas (ePBS) fork scheduled).

Ask

• Emit a single INFO line at startup, e.g. Boole fork scheduled with an epoch field (SSVForks.Boole), analogous to the Gloas log. Optionally include the current-vs-next domain types (DomainType / NextDomainType, DomainTypeAtSlot), which are the visible effect of the fork.
• A DEBUG twin for the disabled case (Boole == math.MaxUint64, i.e. unscheduled — the live-net default) would mirror the Gloas fork not scheduled pattern and flag a misconfiguration on a net where Boole should be scheduled.

Why it helps

• Lets a harness/operator discover and cross-check the Boole fork epoch across the fleet (fork-awareness) instead of inferring it indirectly.
• Symmetric with the existing Gloas boot log, so tooling can treat both forks uniformly.
• Nice-to-have, not a blocker: Aetheria works by taking the epoch as configuration — but a boot log makes the fork-awareness assertion direct, cheap, and robust to config drift, and is generally useful for operators verifying a scheduled fork.

Grounding

networkconfig/ssv.go (SSVForks.Boole), networkconfig/network.go (BooleForkAtEpoch / DomainTypeAtSlot), beacon/goclient/spec.go (the Gloas analog to mirror). Related: ssvlabs/aetheria#168, #2941 (Boole → stage convergence).