chore: establish local platform baseline

internal/deviceauth/identity.go

@@ -0,0 +1,24 @@
+package deviceauth
+
+import "context"
+
+type contextKey string
+
+const identityKey contextKey = "device-identity"
+
+type Identity struct {
+	ID            string
+	PublicID      string
+	TenantID      string
+	Status        string
+	CredentialRef string
+}
+
+func WithIdentity(ctx context.Context, identity Identity) context.Context {
+	return context.WithValue(ctx, identityKey, identity)
+}
+
+func FromContext(ctx context.Context) (Identity, bool) {
+	identity, ok := ctx.Value(identityKey).(Identity)
+	return identity, ok
+}