Release 1.4.0: macOS CLI builds and multi-platform update channel.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/update/update_other.go

@@ -0,0 +1,15 @@
+//go:build !windows && !darwin
+
+package update
+
+import (
+	"context"
+	"fmt"
+)
+
+// Apply is not implemented on this OS yet.
+func Apply(ctx context.Context, manifestURL string) (string, error) {
+	_ = ctx
+	_ = manifestURL
+	return "", fmt.Errorf("автообновление пока только для Windows и macOS")
+}