perf: put MLOAD/MSTORE/MSTORE8 and SHL/SHR/SAR on the Tier-1 dispatch path - #101

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5, goto-bus-stop/setup-zig@abea47f85e598557f500fa1fd2ab7464fcb39406. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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