1-BIT ENGINE — 4 GATES + 2 OBSERVERS

One physical bit, time-multiplexed. Observers stay. Hypercube phase = gatekeeper.

StepBitGateObservers0:0=1=0?
100:1(a)0→0
200:1(b)0→0
310:0=1=00→1YES
411:11→1
500:1(a)1→0
600:1(b)0→0
710:0=1=00→1YES
811:11→1
900:1(a)1→0
1000:1(b)0→0
1110:0=1=00→1YES
1211:11→1

Run forever — every 4 steps you get a complete system on a single bit.