chore(node): preserve pre-canonicalization experiment snapshot

Historical working copy retained for audit before consolidation into main. The canonicalized plugin architecture and later fixes already live in main; this snapshot is not a release or a request to restore obsolete source layout.

apps/node-agent/internal/node/pairing.go

@@ -39,20 +39,21 @@ type PairState struct {
 	Revocations []CoreBinding `json:"revocations,omitempty"`
 }
 type Pairing struct {
-	Sensors       *Sensors
-	mu            sync.Mutex
-	path          string
-	store         *Store
-	state         PairState
-	now           func() time.Time
-	inventory     func() Inventory
-	version       string
-	lastSeen      int64
-	connection    string
-	listenError   string
-	failureWindow int64
-	failures      int
-	clients       map[string]*http.Client
+	Sensors          *Sensors
+	DeviceEnrollment *DeviceEnrollment
+	mu               sync.Mutex
+	path             string
+	store            *Store
+	state            PairState
+	now              func() time.Time
+	inventory        func() Inventory
+	version          string
+	lastSeen         int64
+	connection       string
+	listenError      string
+	failureWindow    int64
+	failures         int
+	clients          map[string]*http.Client
 }
 
 func OpenPairing(store *Store, dir, version string, inventory func() Inventory) (*Pairing, error) {