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Avid's 3,500-word build log: Jev as a decision layer inside keel, a local-first Rust coding workspace. One principle carries it: a model can suggest the next move, the host still owns the move — the host prepares the menu, Jev picks from it, the host checks again; pinned routes and live sessions bypass automatic selection; selection grants no permission. Plus how decision receipts become replayable evaluation scenarios.
Jev-style fixed-answer scoring reproduced locally with SGLang /v1/score: single-token labels, restricted softmax, confidence-gated routing, and a 6 ms vs 1088 ms benchmark against generation.
A deep read of TypeSafe's first System One Model: three question primitives, the economics of parallel calls, confidence-gated routing, eval caveats, eight jagged edges, and the OpenJev local repro.
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