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port: drop DMA wait-loop, UIF-only bus_done is correct - #37
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Removes OW_PORT_DMA_WAIT_IDLE (shared core + F4) and the SR flush. Bench showed the 127.9C was stuck sensors from debugger halts, not a firmware race: with fresh sensors the original UIF-only bus_done gives valid temps at 8/64/72MHz across all multi-sensor examples. UIF-only has no extra flag checks and no hang risk.