The only use was channel-registry.ts checking `err instanceof NetworkError` to retry transient setup failures. Switched to a duck-type predicate (`err.name === 'NetworkError'`) so the dep is no longer needed at trunk level. Channel skills bring it in transitively when they install their Chat SDK adapter package. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>