Excel 365 calculation engine in C++17: evaluate formulas and recalculate .xlsx / .xlsb workbooks without Excel. Ships as WASM (browser / Node), a Python package, and a native CLI.
Offline-capable woodchopping prediction and handicap engine. Trusted V2 production core plus an auditable V3 adaptive-ensemble release candidate with competition-scoped contracts. V3 is not production-eligible.
