Fix dependency uninstall pruning for live imports

[wolfy-j]

Summary

• pass the registry dependency resolver into Hub dependency expansion
• skip module-entry deletes when a remaining live entry still imports the target via the declared dependency patterns
• add a synthetic regression for uninstalling a root that shared a library with a baseline app entry

Tests

• go test ./boot/deps/hub ./boot/components/core ./system/registry/...
• go vet ./boot/deps/hub ./boot/components/core