trap_hunt, palette_bench and room_escape ran the frame through NeuralAgent::tick, which installs
a frame and its rewards after the next ticks: one frame behind the stream, with the ratchet
observed without the objective signal and a rollback that never re-observed the scene. They now
restore the way the stream restores and run LegacyFrame::transition and ::boundary, looking in
through FrameObserver; FLY_TRACE works in each of them. The stub-readout drivers of
rom_macros_mode, rom_catch and scene_probe run LegacyFrame::execute and ::stub_advance, which are
the same calls they made, in the same order.
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