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flow_warm_validate.py warms in rounds (the heater at 50 percent for three minutes, off, 45 s of circulation, the two sensors' mean read) and judges the target on that mixed bulk, not on the upstream sensor beside the heater, which reached any target within two minutes while the bulk had barely moved. Run with a 28 C target the loop plateaus at 27.2 C in a 20 C room; six checks at 26.2 to 27.2 C read every verdict right, the flow band under 11.9 C and the no-flow band over 18.0 C against the 14.4 C limit. CAMPAIGN-LOG records the run; BRINGUP item 1 keeps only the button-latch check, the flow check's bands holding from 19 to 27 C. No catalog consequence: a bench tool and documentation.