DEV-C P2: expiry cleared manifest but left the cached git-host client.
The initializer rebuilds gitHost on demand, so clearing here is safe.
No new test: index.ts has top-level chrome.* side effects that make it
expensive to import in a unit test, and the change is a one-liner state
mutation in an inline callback. Manually verified by tracing call sites.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>