fix: preserve strong BM25-only matches - #143
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Summary
Fixes strong BM25-only matches being removed during post-graph filtering.
BM25 already contributed to the combined ranking score, but the final signal gate only checked semantic, graph, and coherence
scores. Exact matches for identifiers, filenames, and uncommon terms could therefore disappear when semantic similarity was low.
Changes
Testing
npm test
npm run typecheck
Both pass.