chore(infra): spin down vana agents (ENG-4333)

[haggis-hyperlane]

Summary

• Disable relayer/validator/scraper for vana in mainnet3 agent.ts (set false in all three role blocks).
• Remove the vana entry from aw-validators/hyperlane.json so the validator stops deploying.
• Chain key remains defined (false), so config validation still passes; no agent-config JSON regen needed (that JSON is built from environmentChainNames, not per-role flags).

Part of the Vana paid-chain deprecation (ENG-4333), contract-end date 2026-08-06. Companion registry PR marks vana deprecated: hyperlane-xyz/hyperlane-registry#1642.

Context

• Transfer target 0xDDF71a6ddf3FCABBbA4D607b57f0f6Fc0265bb84 verified as a Gnosis Safe v1.4.1 (3/7) on Vana; the two warp routers are already owned by it.
• Vana core contracts (mailbox 0x3a46…775E, proxyAdmin 0x2f2a…85A7) are still owned by the AW deployer 0x486815…E433 — ownership transfer to the multisig is a separate step.

Follow-ups (not in this PR)

• Full config removal (balances JSONs, validators.ts, rust mainnet_config.json, SDK multisig defaults, .registryrc bump, etc.) — the heavyweight chore: remove … batch, done once agents are confirmed down.
• Core-contract ownership transfer to the customer multisig.

Test plan

• Pre-commit hooks green (lint/format/typecheck)
• After next mainnet3 agent deploy, confirm vana relayer/validator/scraper no longer deploy

[paulbalaji]

Reviewed at 8f9ff1d4355aa23c47bb1748899b17600ce4dc65. Approved: all three role maps exclude Vana, the AW validator artifact is removed, and focused agent-config validation/typecheck/lint/format pass. One required rollout step is noted inline.

[paulbalaji]

Rollout ownership update: live cluster state has vana-validator deployed in both mainnet3 (legacy release) and validator-mainnet3 (migrated release). After this merges I will uninstall both; removing only the migrated release would leave the legacy validator signing. I will then redeploy only the Hyperlane relayer/scraper and verify Vana is absent from their running configs.