Function encode_payload

nodedb-vector/src/rerank/codecs/bbq.rs:29–37

(query_norm: f32, centered: &[f32])

// ── Payload helpers ───────────────────────────────────────────────────────────

fn encode_payload(query_norm: f32, centered: &[f32]) -> Vec<u8> {
    // Layout: 4 bytes alpha (query_norm f32 LE) || dim * 4 bytes centered f32 LE
    let mut buf = Vec::with_capacity(4 + centered.len() * 4);
    buf.extend_from_slice(&query_norm.to_le_bytes());
    for &x in centered {
        buf.extend_from_slice(&x.to_le_bytes());
    }
    buf
}

fn decode_payload(payload: &[u8], dim: usize) -> Result<(f32, Vec<f32>), RerankError> {
    let expected = 4 + dim * 4;