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fix: raise semantic distance threshold for voyage-4-lite
voyage-4-lite 1024d produces tighter cosine distance ranges than
voyage-3-lite 512d, so the old 0.5 threshold was filtering out all
results for many queries (e.g. "community builders" returned 0 results).
Raise to 0.75 to let tpuf's natural ranking handle quality.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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backend/src/search.zig
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backend/src/search.zig
···
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for (results) |r| {
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if (count >= 20) break;
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// skip results with high cosine distance (low similarity)
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-
if (r.dist > 0.5) continue;
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+
// voyage-4-lite 1024d produces tighter distance ranges than voyage-3-lite 512d
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if (r.dist > 0.75) continue;
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// skip documents with empty/test titles
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if (r.title.len == 0) continue;
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if (platform_filter) |pf| {