chore: bump version

- update demo and main.c for 3588s display
- add *.o to .gitignore to exclude build artifacts
- version 1.5.4 -> 1.5.5

package.json

@@ -1,6 +1,6 @@
 {
   "name": "clawd",
-  "version": "1.5.4",
+  "version": "1.5.5",
   "description": "Claw Box daemon - connects local Linux box to claw.cutos.ai via WebSocket",
   "main": "lib/client.js",
   "bin": {