`build_landmarks` is the `0x4a6819` walk of `[0xc0e054]` lifted out of `feed_world_map`, so
the landmark list can be built against a world state without a live `WorldMapUiData` feed.
The guard-directions marker stays with the caller, appended after it, as `0x4a69c7` has it.
The new test drives the whole path — resolve the instance map, project through its rect,
gate by flag, exploration and world state — against the real catalogues. Alterac Valley's
towers and graveyards are `AreaPOI` rows on map 30, each objective owned by a separate
`WorldStateID` row at one position, so the row whose state the server set is the one that
lands: before any state arrives only the six ungated rows show, and afterwards the held
objective shows once with its own POIIcon cell, not every owner variant.
chairmanpow
28cac71578