Introduce the Sovryn Perimeter Fee on Zero - #10
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Phase 1 of the Sovryn security perimeter (SIP-0094): a minimal exit fee on user-initiated withdrawal surfaces, funding continuous exit monitoring. This change carries the Zero half of the system: - exit-fee hooks in BorrowerOperations on collateral withdrawal and trove closure, quoting through the shared ExitFeeController (Sovryn-perimeter repo) and paying the fee leg to the ExitFeeVault; every hook fails open — a fee fault forgoes the fee, never blocks a withdrawal; - the surplus-claim surface: CollSurplusPool.claimCollWithFee, a BO-only two-leg split that keeps claimColl byte-untouched, with the pool implementation upgrade ordered strictly before the BO upgrade inside SIP-0094 executable part 1; - impl-only deploy scripts for both contracts (the proxy swaps are governance actions), storage-layout zero-diff guards, and the ColFee test suite incl. reentrancy/fail-open matrices and Echidna invariants. The fee system deploys disabled and enables only by governance after post-deployment verification.
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Phase 1 of the Sovryn security perimeter (SIP-0094): a minimal exit fee on
user-initiated withdrawal surfaces, funding continuous exit monitoring.
This change carries the Zero half of the system:
closure, quoting through the shared ExitFeeController (Sovryn-perimeter
repo) and paying the fee leg to the ExitFeeVault; every hook fails open —
a fee fault forgoes the fee, never blocks a withdrawal;
two-leg split that keeps claimColl byte-untouched, with the pool
implementation upgrade ordered strictly before the BO upgrade inside
SIP-0094 executable part 1;
governance actions), storage-layout zero-diff guards, and the ColFee
test suite incl. reentrancy/fail-open matrices and Echidna invariants.
The fee system deploys disabled and enables only by governance after
post-deployment verification.