Round FTS5 score floats in API baseline normalization
Score values from SQLite FTS5 drift slightly when the index is rebuilt,
causing spurious baseline test failures. Round score to 1 decimal place
in normalize() — same pattern as the existing mtime zeroing — and
regenerate the two affected search baselines.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>