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4-tier FREE_STRICT search: prefix → title → early paragraphs → body. D1-only (FTS5), 5 min cache.
Limit 50 guard enforced server-side. Results deduped by document and ranked 1500/1000/200/0 per tier.
4-tier FREE_STRICT search: prefix → title → early paragraphs → body. D1-only (FTS5), 5 min cache.
Limit 50 guard enforced server-side. Results deduped by document and ranked 1500/1000/200/0 per tier.