Book

# 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**.)*

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