[aq1018]

• sweeps: two more row-store columns, the duty's sign (the drive's direction through a reversal) and the tick counter; the zero replay's columns are unchanged
• zero: zero_rows, the float tracker's awake zero each row may use (the state after the row before)
• speed: emf_run, the back-EMF speed over a run of rows as a controller meets them (both brush forms, the valid rule as a ValidRule)
• potframes: the camera sitting as series for a causal estimator (chain and segment tables, the smoothed tag as truth, the series with lost rows filled and marked)
• gate outside the repo: every lifted piece equals the reviewed scratch code bit for bit over all 21 chains