feat(rommie): add JPEG quality and size cap for get_screenshot

- Add ROMMIE_SCREENSHOT_JPEG_QUALITY and ROMMIE_SCREENSHOT_MAX_KB env vars
  to control parent-agent screenshot output encoding and size limit
- Configure defaults (quality 80, 512KB cap) in caliban.incus host vars
- Trigger rommie service restart when .env file changes

ansible/rommie/deploy.yml

@@ -52,6 +52,8 @@
         src: .env.j2
         dest: "{{rommie_repo}}/.env"
         mode: '0600'
+      notify:
+        - Restart rommie
 
     - name: Deploy Rommie systemd service
       template: