Phase B's WorldPicker change added cellOccluder to both Pick overloads,
but the integration test suite only covered the legacy ray-sphere
overload. The production code path (GameWindow.PickAndStoreSelection)
uses the screen-rect overload, and its clip.W depth-conversion math
had no direct test. Adds two integration tests mirroring the existing
ray-sphere variants:
- Pick_ScreenRect_EntityBehindWall_OccludedByCellBsp — entity dead-
ahead, wall between, with cellOccluder → null.
- Pick_ScreenRect_NoWall_HitsEntity — same scene, null occluder → hit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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