Status: IN
The hybrid fan-out strategy is the codebase's most explicit instantiation of access-frequency-adapted cost allocation: the celebrity threshold converts the abstract principle (shift work to the cheaper path based on access pattern) into a concrete runtime decision boundary, dynamically partitioning authors between write-amplified push and read-time merge-pull to bound both paths simultaneously.
the celebrity threshold makes the per-use-case cost adaptation principle into a concrete, observable mechanism
Depends on (SL): hybrid-fanout-bounds-both-write-and-read-cost, cost-model-adapts-to-access-frequency