devnet-7: compounding validators, big-state vset spray & 8282 deploy startup test

[qu0b]

What

Three devnet-7 genesis/config changes on top of the merged prep (#35):

1. WITHDRAWAL_TYPE=0x02 + VALIDATOR_BALANCE=1024000000000 (1024 ETH) — re-added as the only spec overrides on top of the egg defaults, so consolidations are actually testable: two 1024 ETH compounding validators consolidate exactly into one 2048 ETH max-EB target. Note the unit: eth-beacon-genesis consumes this value verbatim as Gwei — the previous consolidation attempt failed because 40 ETH (40000000000) was used where 400 was intended, and devnet-6's committed 2048 never matched its actual launch genesis (on-chain genesis validators are 40 ETH / 0x02). An in-file comment now pins the unit.

2. 500k exited-validator spray (ADDITIONAL_VALIDATOR_MNEMONICS) — bumps the registry from 3k to ~503k entries so SSZ-hashing perf differences are measurable (devnet-7's focus). The sprayed validators are status: 2 (exited, never attest) with 0x00 BLS creds (withdrawal sweep skips them — no withdrawal churn, no EL ETH minting) and start: 1000000 (key indices clear of organic post-genesis deposits). Validated by running egg 6.1.3 in docker with a 50k spray: ~140B/validator on top of ~2.7MB fixed → genesis.ssz ≈ 73MB (GitHub's 100MB file cap bounds this approach at ~680k); validator_names.yaml stays compact (one range line). Active set / NUMBER_OF_VALIDATORS unchanged at 3000.

3. Registers deploy-eip8282-contracts as an assertoor startup test via the new gen_kubernetes_config_assertoor_tests var — the pre-gloas deployment of the builder request contracts that genesis omits (DEPLOY_EIP8282_CONTRACTS=false).

Dependencies / merge order

• Add pre-fork EIP-8282 contract deployment playbook (gloas-dev) assertoor#217 — the playbook this registration points at (must merge first so the raw URL resolves)
• feat(generate_kubernetes_config): make assertoor test list configurable ansible-collection-general#559 — the gen_kubernetes_config_assertoor_tests template hook (must merge before the devnet-7 generate_kubernetes_config run; until then the var is inert)

[qu0b-reviewer]

🤖 qu0b-reviewer

Based on my analysis of the diff and the full file, I found one verified issue:

Summary

This PR enables compounding validators (WITHDRAWAL_TYPE=0x02, VALIDATOR_BALANCE=1024 ETH) for consolidation testing, sprays 500k exited validators for SSZ-hashing benchmarks, and registers an assertoor startup test to deploy EIP-8282 contracts before the GLOAS fork. The genesis env vars and math are correct. The one problem: the referenced assertoor playbook does not exist.

Issues

• 🟡 ansible/inventories/devnet-7/group_vars/all/all.yaml:217 — The gen_kubernetes_config_assertoor_tests entry references https://raw.githubusercontent.com/ethpandaops/assertoor/master/playbooks/gloas-dev/deploy-eip8282-contracts.yaml, but that file returns 404. Neither the ethpandaops/assertoor master branch nor the qu0b fork has it (the gloas-dev directory contains no deploy-eip8282-contracts.yaml file). Assertoor will fail to load this startup-scheduled test at genesis, so the EIP-8282 contracts won't be deployed before the GLOAS fork at epoch 30. Either the playbook needs to be created in the assertoor repo first, or the URL points at the wrong location.

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_{Reviewed @ cf1cb8c2
"Backups are useless. Restores are everything."}