Mutation M13 (a battery out of the split counted in the house point)
survived; a direct check now kills it. win[0] is read through a guard
(test_named_absence).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
While a battery settles from its ended drain (SAFETY-95), the house point
was grid + every battery's reading. A register can be 10 s older than the
meter, so B swung 860 -> 1650 -> 870 W on A's old reading (rig check 5).
Now the house point is held and moved only as far as the meter proves:
each battery is between its last changed reading and its commands since
(a reading that changed this cycle, or a refused side, as it reads).
N=1 and 1 s registers are byte-identical to release/1.0.
DECISIONS/SAFETY-103-old-readings-after-a-drain.md, test_safety103.py.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>