feat(adapters,testkit): guarded qB data deletion (B7) and mock qB file materialization (B8)
adapters: assertSafeToDeleteData({contentPath, libraryRoots, importVerified}) rejects
paths inside/equal to/above any library root, relative or root paths, empty roots and
unverified imports; QbClient.delete({deleteFiles:true}) requires a per-hash
SafeDeleteCheck and throws DownloaderError('unsafe_delete') before sending anything.
testkit: mock qB complete(hash, {files, writeFiles}) writes random-content files under
save_path (opt-in, size-capped, traversal-safe); deleteFiles=true removes them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
