validators/v3 package

Package validators implements on-chain validator set management through Proof of Authority. The realm exposes a public proposal constructor for GovDAO; on approval, the proposal callback applies the captured deltas to the chain's effective valset and publishes the new full set via gno.land/r/sys/params. The chain's EndBlocker reads the result on the next block and propagates to consensus.

No in-realm validator state. All reads go through sysparams.GetValsetEffective (proposed-if-dirty, else current).