[apotema]

Bounded endpoint preparation must continue past the previous batch instead of repeatedly selecting newly invalidated low-ID entities. This adds world-local selection scratch that chooses a deterministic rotating batch from current ECS-derived pending identities. View order, duplicate membership and deletion of the cursor entity do not change the policy.

Stacked on #62. The cursor advances at the caller's publication barrier after the complete batch is processed; rejected stale results consume their turn too. Allocation failure leaves an empty batch without moving the cursor. There is no default budget or persistent authoritative pending queue.

This is selection machinery, not complete serial preparation. Controller participant discovery, snapshots, searches and CMN publication remain to be wired. Discovery costs O(candidate count × budget), so bounding search count is not a frame-time guarantee; measure the complete pipeline before choosing a budget. See rfc/prepared-endpoint-implementation.md.

Validation: zig build test spec passed (13 unit tests, 81 navigation specs). Five new cases cover fairness, wrap/deletion/insertion, duplicate views, OOM, empty/zero-budget batches and all permutations of a small candidate set. All 20 Flying Platform test targets passed with the local dependency overrides.

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