[apotema]

Prepared distance matching needs to reject stale endpoints without resolving positions or rebuilding Floyd–Warshall during a query. This first slice adds transient CMN publication metadata and explicit, read-only access to a prepared distance table.

CMNs distinguish pending, ready and completed off-graph results. Publication validates captured world/entity/position/graph inputs; invalidation preserves the last node and its original stamp for debugging. Obsolete results cannot overwrite a newer publication. The table query returns finite cost or null and never repairs a dirty graph.

Part of https://github.com/moca-tecnologia/flying-platform-labelle/pull/1046. This is deliberately a foundation: engine mutation hooks, registered movement-node dispatch, rotating bounded preparation, legacy writer migration and gameplay query migration remain outstanding. Existing game matching behavior is unchanged. The low-level node query does not validate entity readiness; consumers must not use it to bypass that contract.

Validation: 13 unit tests and 76 navigation specs pass (zig build test spec); all 20 Flying Platform test targets pass against the local dependency override. Five new regression tests cover stale stamps/identity, off-graph completion, obsolete publication, node zero, and no-repair table access. See rfc/prepared-endpoint-implementation.md for the remaining integration boundaries.

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