feat(t3): background machine is dell-dev, the vm that runs t3 after the dell move

docker-compose.yml

@@ -109,8 +109,8 @@ services:
       T3CODE_MCP_HOOK_URL: http://gateway:62990/hooks/t3code
       T3CODE_MCP_STATE: /data/t3code-mcp.json
     extra_hosts:
-      # контейнер резолвит имя своего хоста в 127.0.1.1 - даём tailnet-адрес явно
-      - "dell:${T3_DELL_ADDR:?T3_DELL_ADDR=tailnet ip of dell}"
+      # tailnet-адрес дев-VM явно, не завися от DNS хоста
+      - "dell-dev:${T3_DELL_DEV_ADDR:?T3_DELL_DEV_ADDR=tailnet ip of dell-dev}"
     volumes:
       - ./t3code.toml:/config/t3code.toml:ro
       - t3code-state:/data