Upgrade Across to support Non-EVM and Prefills

**Author(s):** Risk Labs **Status:** Proposed --- ### Summary: This proposal seeks approval from the ACX community to implement an upgrade to the Across Protocol. The upgrade introduces the capability for Across to support non-EVM chains and enable "prefill" use cases, where the fill comes at the same time or before the deposit. These changes are designed to expand Across' reach, improve user experience, and strengthen its position as a leading cross-chain bridge. ### Motivation: Supporting...