web/src/scenario/unit-art.ts named the 61 designs the scenario catalog fields and had to be regenerated whenever one changed. The index carries all 8,456, so unit-art.ts asks for the handful a screen draws: /api/units/art answers in a few hundred bytes, and the index itself is the fallback when the API cannot be reached - the same data, shared with the force builder. library() moves out of megamek.ts, which is imported by tests that run under plain node and cannot resolve an extensionless import of api.ts. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Change-Id: Ib5bd24049aa96dbe056ac301ad4d6a6bb37449d3