## Why
Daemon updates must honor application network restrictions and stop when their configuration cannot be loaded.
## What changed
Activate the configured application network policy before creating the HTTP client for daemon updates and the PID update loop. Propagate configuration errors instead of falling back to a default HTTP client.
## Testing
Add tests for configuration error propagation and managed network requirements, covering denied and unlisted destinations as well as an allowed destination. Retain coverage for `features.respect_system_proxy`.
GitOrigin-RevId: 960485c7c57f34654402d7316cab9e0f66f24af3