Brummel c787488e64 plan: 0083 cost-node trait + shared cost-record contract ...

6 tasks: (1) new cost.rs — CostNode trait + CostRunner<F> + cost_node_builder +
shared COST_FIELD_NAMES/COST_WIDTH/GEOMETRY_WIDTH + runner tests + author doctest;
(2-3) migrate ConstantCost/VolSlippageCost to thin factors; (4) CostSum reads the
shared contract; (5) main.rs reads aura_std::COST_FIELD_NAMES; (6) workspace gate.
Behaviour-preserving — the existing suite is the regression net.

refs #148

2026-06-28 18:21:12 +02:00

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0083-cost-node-trait.md

plan: 0083 cost-node trait + shared cost-record contract

2026-06-28 18:21:12 +02:00