Book

The set of Positions an expert currently holds: its portfolio. The output of the model, where the three horizons used to terminate in a read. A Book is repositioned on the Program's cadence, never rebalanced silently — every change arrives as a proposal with its reasoning attached. Two Books run against one signal set: Book A (equal-weight, horizon-exit) is the measurement; Book B (confidence-sized, invalidation exits) is the product. (Not to be confused with the source ledger or with constellation portfolio Stories — when the rollup sense is meant, say rollup.)