fix: use lexical search_issues for scoped and syntax queries - #3265
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On github.com, search_issues defaulted to semantic search, so keyword and GitHub search-syntax queries silently returned near-empty or unrelated hits. Choose lexical when owner/repo scope is set, when the raw query looks like issues search syntax, or when search_type is lexical. Keep semantic for open-ended natural-language queries, with an explicit search_type override. Closes github#3188
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Summary
search_issueswas always semantic, so keyword / search-syntax queries could return near-empty or unrelated results while REST lexical search was correct.owner+repoare set, when the raw query looks like GitHub issues search syntax, or whensearch_type=lexical.search_type=semanticto override.search_issuestoolsnap/docs.Closes #3188
Test plan
script/lintUPDATE_TOOLSNAPS=true go test ./pkg/github/ -count=1script/generate-docs