Simd-0525

Network-reported block times put the new slots at about 267 milliseconds on average, the same roughly 16-millisecond overhead that sat on top of the 400, 350 and 300 millisecond targets before it. Block limits fell in proportion, so throughput stays at 150 million compute units a second.

SIMD-0525 shortens each epoch to 42 hours and rotates validators every 1.4 seconds. The change cuts confirmation latency without adding throughput; three more 50ms cuts are queued.