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Transfer supported Box2D bodies through rigid area portals - #698
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The Box2D adapter can move one supported whole body between independent area worlds through a rigid portal. Each world steps once before crossing collection; non-stepping staging preserves the source until destination creation succeeds, then commits entity ownership and publishes one traversal. Missing, blocked, full, joint-connected and invalid staging cases retain source ownership; uncertain effects stop the owner with best-effort actual-state inspection.
Preserves supported circle/box descriptors, material, momentum and current awake state. Exit hysteresis prevents immediate reverse traversal, and portal-aware interpolation snaps moved entities. Fixed Runtime filter/damping/sleep defaults remain the supported state boundary. Adds a real rotated two-area entry point, focused tests and generated adapter surface baselines.
Validation: the real
Box2D.Portalsentry passed with one body/entity/traversal, mapped position(9.9,5.15), velocity(-1,4), angular velocity2, and exact five-tick replay under Box2D.NET 3.1.654, .NET runtime 10.0.12 and SDK 10.0.401. Pose/momentum tolerance is2e-5; staging directly constructs rotation to avoid compounding the engine approximation. All 11 focused tests passed, including real staged-body cleanup under an explicitly injected commit interruption; that injection does not claim a native allocator failure. Complete 13-project solution build passed with zero warnings/errors; canonical refresh changed only adapter baselines. Native repository checks and merge readback remain pending; publication and installed support remain separate.