Hardware finding from the first r4 run on the phone: the focus-loss
detector compared the settled scene against the maximum sharpness
recorded during the sweep, which was measured under a different AGC
state. On the FP6 that maximum read 4848088 and the same position two
stats frames later read 1995445, so the detector fired immediately and
the lens swept forever. Patch 0014 takes the reference after the lens
settles and requires four consecutive out-of-band frames.
Verified on the phone: r4 re-swept without end, r5 completes one sweep
and stays put.
