`tilt down` hangs when offline due to git pull in extension directory

Expected Behavior

I should be able to run tilt down regardless of my internet connection status.

Current Behavior

When I try to run tilt down while offline, the command gets stuck. It appears to be attempting the following behind the scenes before executing command hooks or proceeding with the normal teardown process:

cd "$LIBRARY_DIR/tilt-dev/tilt_modules/github.com/tilt-dev/tilt-extensions"; git pull

Steps to Reproduce

1. Run tilt up on a Tiltfile that uses extensions (while online)
2. Disconnect from the internet
3. Run tilt down

Context

Tilt: v0.34.2, built 2025-04-09
System: darwin-arm64
---
Docker
- Host: unix:///var/run/docker.sock
- Server Version: 26.1.5
- API Version: 1.45
- Builder: 2
- Compose Version: v2.33.0
---
Kubernetes
- Env: rancher-desktop
- Context: rancher-desktop
- Cluster Name: rancher-desktop
- Namespace: default
- Container Runtime: docker
- Version: v1.30.11+k3s1
- Cluster Local Registry: none

About Your Use Case

I was just trying to work outside the office, offline. Ideally, tilt down should still work in this scenario without getting blocked by a failed network operation.

Start by tracing the tilt down entry point and teardown flow, focusing on the extension directory operation that runs git pull. Reproduce the issue offline after tilt up with an extension, then verify that tilt down proceeds with command hooks and normal teardown without blocking on the network operation.