chore: justify the cast_precision_loss allows with reasons (#1474 slice)

hive-c0re/src/hive_stats.rs

@@ -205,7 +205,10 @@ fn read_agent(path: &Path, from: i64) -> rusqlite::Result<AgentAgg> {
         agg.cache_read = agg.cache_read.saturating_add(cache_read);
         agg.cache_creation = agg.cache_creation.saturating_add(cache_creation);
         let p = model_prices(&model);
-        #[allow(clippy::cast_precision_loss)]
+        #[allow(
+            clippy::cast_precision_loss,
+            reason = "token counts stay well under f64's 2^53 exact-integer range, so this cost computation loses no precision"
+        )]
         {
             agg.cost += (input as f64 * p.input
                 + output as f64 * p.output