Function select_digest_facts

src/hooks/memory_inject.rs:134–171

Picks the top-`k` digest facts from a trust-filtered candidate list: secret-like facts are dropped, then one highest-trust fact per category is taken first (category diversity), then remaining slots fill by trust with newest-first tiebreak.

(mut facts: Vec<FactRecord>, k: usize)

/// taken first (category diversity), then remaining slots fill by trust with
/// newest-first tiebreak.
pub fn select_digest_facts(mut facts: Vec<FactRecord>, k: usize) -> Vec<FactRecord> {
    facts.retain(injectable);
    facts.sort_by(|left, right| {
        right
            .trust_score
            .total_cmp(&left.trust_score)
            .then_with(|| right.updated_at.cmp(&left.updated_at))
            .then_with(|| right.fact_id.cmp(&left.fact_id))
    });
    let mut selected: Vec<FactRecord> = Vec::with_capacity(k.min(facts.len()));
    let mut seen_categories = HashSet::new();
    let mut deferred: Vec<FactRecord> = Vec::new();
    for fact in facts {
        if selected.len() >= k {
            break;
        }
        if seen_categories.insert(fact.category) {
            selected.push(fact);
        } else {
            deferred.push(fact);
        }
    }
    for fact in deferred {
        if selected.len() >= k {
            break;
        }
        selected.push(fact);
    }
    // Deterministic render order: trust desc, newest first.
    selected.sort_by(|left, right| {
        right
            .trust_score
            .total_cmp(&left.trust_score)
            .then_with(|| right.updated_at.cmp(&left.updated_at))
            .then_with(|| right.fact_id.cmp(&left.fact_id))
    });
    selected
}

/// Filters prompt-recall search results down to facts that are actually
/// relevant to the prompt (lexical FTS match or meaningful token overlap and a