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* test: add HEVM formal verification tests for bridge contracts Adds 27 symbolic execution proofs using HEVM covering access control, input validation, token accounting, and supply conservation across Inbox, BridgeMinter, BridgeBurner, and end-to-end bridge round-trips. 23/27 pass with HEVM v0.57 + z3; 4 hit known engine limitations (vm.sign through DELEGATECALL proxy, symbolic byte array allocation). Uses a standalone FormalTestBase that deploys via new + ERC1967Proxy (no vm.etch) since HEVM does not support that cheatcode. * chore: migrate to halmos
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This PR adds a set of contracts for bridging stablecoins between any number of chains. The burn-and-mint bridge architecture is explained in
docs/bridge.md.