pub fn confidence(record: &EvidenceRecord, now_ms: u64) -> u8Expand description
Compute confidence from an evidence record.
The formula is: c = clamp(0, 100, support_count * observation_w + distinct_sources * source_w - refute_count * refute_w - age_penalty * days_since_first)
Crucially, recall energy / Hebbian activation never appears here (C1).