bump: agent version 0.1.20 -> 0.1.22

v0.1.22 minimum version for security features
machine binding and version enforcement

agent now sends version during registration
no bootstrap gap

aggregator-agent/cmd/agent/main.go

@@ -28,7 +28,7 @@ import (
 )
 
 const (
-	AgentVersion = "0.1.20" // Phase 1: Granular subsystem commands and parallel scanner execution
+	AgentVersion = "0.1.22" // v0.1.22: Machine binding and version enforcement security release
 )
 
 // getConfigPath returns the platform-specific config path