Keep explicit repository search scopes narrow

When a search request explicitly limits repositories, do not prepend a broader owner qualifier unless the search language guarantees intersection. Some providers treat combined scope qualifiers as alternatives, so a well-intended default can widen results. Normalize and validate explicit scopes first, omit redundant broader qualifiers, then independently reject returned repositories outside the requested set. Keep quoted literals and negative qualifiers distinct from positive scopes. This repairs retrieval scope; it does not establish passage relevance, complete recall or artifact completion.

Applies when: A source adapter adds default owner scopes to user-specified repository searches. Keywords: repository search scope qualifier owner widening validation results boundaries