feat(go): port socket detectors

go-agent/internal/model/model.go

@@ -19,9 +19,22 @@ type Process struct {
 // SystemState boundary.
 type State struct {
 	Processes []Process `json:"processes"`
+	Sockets   []Socket  `json:"sockets"`
 	LDPreload string    `json:"ld_preload"`
 }
 
+// Socket matches the Python SystemState socket view. Nil inode/PID values
+// preserve ss records where ownership metadata is unavailable.
+type Socket struct {
+	State string `json:"state"`
+	Local string `json:"local"`
+	Peer  string `json:"peer"`
+	Inode *int   `json:"inode"`
+	Comm  string `json:"comm"`
+	PID   *int   `json:"pid"`
+	Kind  string `json:"kind"`
+}
+
 // Alert matches enodia.alert.v1.
 type Alert struct {
 	SID       int    `json:"sid"`